[1]Patented Jan. 28, 1930 1 , 7 4 5 , 0 3 9 UNITED@@-@@STA TE S. PATENT: OFFICE LANCELOT:XARTIN S iXV's@ ON, OF@ITI,-@,ORNER, NEAR @TEEDS, ENGLAND,, @ASSIGNOR TO, ASSOCIATED TELEPHONE AND TELEGRAPH COMPANY@,@ OF@ ANSAS CITY MISSOURI -A CORFORATION OF DFLAWARE TELEPHONE SYSTEN Applicatioli filed 'J'anuaxy 9,,@,929, @S@rlialNo. 245,348, and@ in@ Great Britain lanuary 13, @1927. T],.i@ pieseiat-invention,relateqi@i@ @elephonpsystems and is i@iiore,partick@l@tly 6cii6or:@ed iv,i'uh a@@DaratLis ior use in, suc - -@st@iii@ for li,s perforinina routine-.tests. -1t,lis gener@,,l recog nized nowad@av@ that it i@ d-es'l-rable that' app'tratus of the@co@i@le@ity of that employed in an, ,ttitomatic -teleDlione excl@a@ge.- sho@ld -6erta'in tests at @t@ited int@rvfil be s]Ctbjected to S so that faults m@@- be discovered@ before they cur in an ,tcttial connection. C@rtaiii of the i@eu t-Li res of the -pres6nt invention are, @pplica-@ ble to routining appara,tus in g@neral@ but,the invention m6@e T)articulA@l@,concerns@aiid has been,evolved in connection with apparatus for, 1,3 testilig - register @tralislator8 @ @vhicil, a e a' r ranoed, to re(,Yister, the,, digits diall d by a, calll.ng party and,- se-nd- out translated@ im-. pulses in accordance, therewith, @,-@kccordii-i to one,-featu of the-invention 9 @ re 20 the apparatus to be roLitined-,is'a-iranged-in gro ps ancl 'a 's-,witching, device "asso6iated iitith each group@ is pro-vided on the operation of Nvhich the ro-Litininy equipment's adapted atitom-,tically . to@ con]7ect@@wit@ and -te8t that @20-,particul-,tr-gr@ouponly. Ace6rdiiio, to--another@feature of the-invenzn tion the apparatus-t' o @bo routined is ar.r'anged arrangen,ients hre .-,provided in aroups and t' wilereby a single S(,,ttiil-,o, 6f the cont ro I ke-vs of @pr 30 tho 1-outii,.ing 6qti@ @en @ecu,re t,he, applicati-oii of -a series:,of,@tests@the@.fnature-@of -which vatiesvin @accorda@nce@-v@ith':th@:gfoup w@ich is@@beina te@@ted..@ fuiither feature @o the @inveiition' is that 35 ill a testing arran rement, Tot the ro@Li@ine--t6st@ Ing of app@ratus as iis6d iii teleph Oni@ yste m the roiizl ,iiiiiig equidrnent@is adapted t6:send ii-i traii-is of @impul@es to the-appa'tatus -Linder teslu- and to receive trains@ 6f-- iih@,ulses there@io f I-Om, a, portion of the 'sending, o@eratioii beiiig dependent upon @ a satisf actor@ @receiviiig o,oeration. TI@ese featii@es and others @n6tspiecifically mentioned@ at @this point will@@-be @moro itill I @ I @ -1 I y -i5 -Liiiderstoocl from thq@followi g@@des n n @ript@o of Olle metliod of carryiiig,the inveiition into eftect which sholilcl be taken inleonj@unctioi@ ivith the ae ompanyip c, drawings. It -,;@ill be understood ho-%Vever that the specife, appliqa50 tion of the@ inventioii shown and described; is gi-@eii b@, -,w@y. 6f exatnple 6nly; and thht various iii6difi6ati@ns to the eireiiit: details Could be made@ bv. @.th6se skill@, d'in'the, art w'itliout exe6ediii6,th6se6pe -of-the@invention., no, i%g now t6. thd drawingscomprisi Figs. i to i2, Filo=,@. 1 il, wheii -prope@l@ fitted @ggetlier show, sufficient of, th@ 6ir6uits @6f a @ t :@s or oti liier uit,@ble' f ' use iii, testing -,reo"ste ,I r translators @of the typ6 @described i th n e co I)endib(@ a ppiication .6f John @E. ' ostiine e@o Serial Srumber, 't55,374 filed on 12th Dee em ber 1924, @to enabl6 the in,venti6n to b@' prop.erly uneterstood, while Fig. 12 sliows a part.of tlle:,cir@uiis which'are'iiot fully'iiieluded in the @ ot-he@ fi(@ures ifi order to a-@oid @confus: I io@ Fi,g. 1, shows the groti,p ro@tine k--y'GRK with @e@tain of the control rel@ys tlirou (yh. tlle 6per@tioli of @ whici@ the @ seiider of the test is @contr6lled. Fig., 2 shows additi6lial:i@ontrol rela@s, th@o@gh the 7 0 o@e'ration of @b wh'ch th6 di,-its. o e trans - iiii.tted b@ ih@,Si@nder ar6 det6rriainea., Fig. 3 shows more of the cont@ol relays,.and@certain of the si@ynal lanips,,-through,- the ope@ation of which the receivin @g 6nd of the test iiiecha- 75 nisrn is che6ked.-- Fiu.'4 sho-ws @ddition@l@ si@,iiial lamps an@ d thc,, im@ulse- cams of the sender m6ch --@a. :@Th@ 'relay,s, shown in tnis @@trol ihe si4 Fig. 4 co nal lamps responsive t@ -tbe ieceipt of ce@t,,tin di@lis from th@ iegis-: so ter trans-lator then under te@t. Fig. 5 shows tli6 grbii@ distiibuto@ GI), a@d: the, @e@-,ister distril)utor R.Dl, and % als6 one bank 360 . of another @egister distribiitor 'Throuoh the o@era tioi@ of ihe:group. d@ rqup 85 of re@yist6@ tran@l@t6rs to ermined; aii4 th6 iecyister I is o@erated'I'to select a' pa@tic 1,,tr translator in that. droup. ifig. 6 @hows sendin gsw@ itch: SS a@d,tlie B relay,timi h@]@ S tlirough go the operatioii of --wliic n ftinctioils , of the translator is tested. Fig@ @ 7 @hows thecontrol 1-,-eys of the test@mechanism:tlirough@the St operat@ioi 3f@-v@hich th@ t@e mechanisiii is arcl@ @@io@ i:@rf@r rticula r :tests on'th e95 Figs. 8 and 9 hes@ rela@s,atfd per -right hand cor f s sbownt e control switell thr t taion of which the sending lo,@
[2]1,745,039 mechanism of the testing device is controlled. Fi-s. 10 aiicl 11 sliow the remainder of the control relays of the sendiiig device and in Fig. 1 1 the ptilse test switch PT together with suitable signal -lamps for supervising the operation of this portion of the test. As may be seen from the above mentioned e,pplicatioii, it is usual to arrange the register transla.tors in a numbei- of aroups havin(Y zn t5 10 differeiit translatin(y f acilities and to select in the proper gi-oup in response to the first dicrit dialled by a calling party. Two further digits representincy the reiiiaiiider of the exchange code are then seiit to a register trans15 lator in the proper group and are suitably translated, while the remainin- four nuinerical digits are transmitted ivithout transla.tion. Accordingly, if the apparatus according to the pi-esent invention is to be arrancyed So to test the register translators in all the groups without alteration, it will be necesstry to have a special test code whicli can be comM()n to all groups, since it )iill be understood that in geiiei-al the same two digits sent iiito 25 the register translators in diff@rent grotips will produce different tra,nslations. The, routining apparatus is connected to th e particular register translator -Liiideitest by way of a grout distributor aiid @in appropriate 3o nu@mber o relister distributors, in the case considered, 14@ a sufficient iitimber of register distribtitors b@inassigiied to each partictilar group of register transl,,itors accoi,diii(y to the size of the ,roup. The re,,ister transtn in 36 lator is taken into use aliead of the one wliich is actually being tested so as to ensure that all shall be routined durinthe test without undue delay, and in case a r@'e(rister translator is busy when seized for testino,, an alarm is 'to (Ylven if it does iiot become idle within a definite tiiiie. Sets of keys are also provided on which the input test number is set up together with the expected output, and in case the output received at any time does not 45 agree with the setting of the output keys the test is stopped and an alarm is given. The number received is also displayed on a suitable lamp panel whetlier correct or incorrect, so that if some f ault shotild oceiir the oo incorrect number may be some indication to the atteiidant of the nature of the fault. The test number is preferably transmitted to the register translator twice tinder conditions representing the extreme tipper and lower 55 working limits of oper-,ition of the switches. Special arran-ements -,ire a-Iso necessary in dealin,- with recrister translators in the tenth or 0 group sinc-e the normal operation is that when such reo-ister translators are requirc!d, io for instance in completing calls to operators, the single letter "O" is dialled, but no other digits. Some special provision is also necessary to deal witli the case in which the subscriber has been instruct6(l to dial three let6i ters only, for instance INF for information, and these arrangements will be fully described in due course. Considering now the detailed operation of the apparatus shown, it will be assumed that a general routine test is to beconducted, that is to sa-y a test on the register translators iii all ten groups. In order to initiate this test tlle attendant operates first the general routine key GRK aiid then the start key SK. When the start key is thrown, at its lower colit acts 75 it completes a circuit over normally closed contacts of the continuous routine key CK, lead 104, baek contact and arm,,tture 19, armature 25', and its back contact, lead 114, windin,- of magnet 359 to battery, over lead 315, 80 through relay 261, and at its upper contacts it complet4es a circuit over lead 98, armattire 26' and its back contact, winding of relay 17 to battery. Relay 17 thereiipon operates after .L slight interval and at armature 18 pre- 85 pares a homing circuit for the various re-ister distributors, at armature 19 opens the ciretiit just traced for ma et 359 of the gn group distributor GD whereupon this switcb adi@ances one step, at armature 20 completes a go eireiiit over lea-d 714, for relay 48, a parallel . for this rela e circuit t@,b ing also completed over lead 128 and operated contacts of the key, SK, at armature 21 prepares a circuit for relay 1, and at armature 22 connects 9,5 eai,tli to motor start lead 23. Earth connected to lead 23 catises the operation of the motor employed to drive the interrupters wbich supply the variotis types of impulses used throti,-hout the testing operations. loo Earth is also connected to this lead at different stages of the operation by armatures 46, 60, 65 and 69 so as to enstire that the niotor for drivin- the various interrupters sball be maintained in operation as long as the 10,5 routiner is in use. Relay 48 at its armatures 49 and 50 completes circuits for relays 59 and 61 and 52 respectively, at its armature 51 opens EL point in the locking circuit extending over lead 94 of rela-y 585 and ,it its remain- 110 ing armatures closes'points in the eiretiits of the indicat 'Y' lamps connected to the normal ' g positions of the various register distribtitors. ]Relays 52, 59 and 61 all operate at this tiine and perform similar functions, the necessity il5 for a plurality of relays being that the ntimber of contacts required is greater than the capacity of a single relay' At armatures 53 and 62 points are opened in the circuits of the relays 63 and 66 one of wllich is ener(,ized 1--o when tihe grotip distributor has connected up one of the re-ister distributors. Wben the@ switch GD advances one step as above described, a circuit is completed for relay 30 as follows: battery, winding of relay 30, lead 125 107, wiper 351 and the second, contact in its bank 9 lead 101, operated left-hand contacts of the general rotitine kev GRK, lead 708, front contaet and armatur@ 50 to cartli. Relay 30 upon operating, at armature 31 locks
[3]iiself -Lip over the left-h@nd co'@t@cts@ of the 'key GRK,@ at armature@32 com-pletes the cir,: Drei)ar6s the 'cuit of relay 1, atarmature:33 test eire-Lilt for tb-e, first ro@iste@ t@anslato.and at arn-iat-Lire 34 opens i point in:the hoining circuit of the switch GD. Relay 1 u@oii operatiiia, at armiture 2 opens a point in the circuit of rel,,iy 37 at@ armat-Lire 3 completes eire-uits for relays 10 @ and 28 b6th of -wlii-cT-i 10 7e slow to ptill up, at ,irmature 4 I.:)rep ares a circuit over lead 108 for rel@y 6 from te.-t lead 373 :of the first register translator, dnd at ariu,,tture 5 prepares a@ circuit for @relay 26 from the @test lead of the next register trans15 IE-,,tor over lea-d 102. Over -,viper 366 of the register translator the eirciiit for the indicating lamp 370 is complet,-d as follows - bet,tery, lamp 370, conductor 122, armature 57 and its front contact, conductor, 125, qrst@ coil-- 20 tact i.n the bank of -wiper 366 and s,,ild wiper, lead 116, winding of relay 63, le,,td 118, second contac' u in the bank of wiper 357 Eltnd sticl wiper to earth. Lanip 370 is accorclin(-Yly lighted to indicate whic,h reuister translator 25 IS tinder test and relay@ 63 is operatecl there-Lipon at armature, 64 prepariiicr a ,@t epl)i-@ig CirdLlit over lead 115 for the mau@et 367 OT tl-ie switch RD!. Asstiminz that the reuister trans'la-tor 3 which is no-w connected wi-Cli, is busy ,it!t'ais time, there - will be an earth@ on the @test concluctor 373 which will be exteiided ove'r 'Wipers 363 354 lead 108 armature 9,3 aiid its front contact@ armature 4 and its front con35 tE@Ct armature;12 and its b,,Lck contact, windingofrelay6tobattery. @Relay6-Lipo@iopeiating at fhis time at armatlire 'i opens the circuit of relay 10 and ,it armatures 8 and 9 prepares circuits over leads 88 aiid 124 for the 40 ptirpose of givin@ an al@rm if th;.s condition persists uiiduly lo-no, as -v@ill be mote ftilly e la-inod subsequently. Similarly if the XP next register translator is busy ,it this tiine, @elay 26 will iiow be operated and at ariii,,i45 ture 27 will open the circuit of relty 28. Wlien this registe.,r translator becomes free, rel,ty 26 falls ,iway and relay 28 6perates, thereupon applyipg ea.rth from operated contacts of t@'he start 13:ey over lead 109 to @the'test 5o lead so as to prevent seizure by a subscriber at this time. Assumina that the @ re,_@ister translator seized f,Dr test shortly bee6mes idle the circuit for relay 6 is 6pened and it deenergizes, thereupon at armatlire 7 coinpletr)5 ing a circuit for rela.y 10 and at armatures 8 and 9 opening the al,,Lrm oireliits. Relay 10 is now energized over armatlire 7 and at armature 11 completes a circuit from e,,trtli, armati,ire 3 aiid its front contact, front con-@ 60 ta-et and armature 11, lead 'tO5, ,trmat-Lire '72 a,nd its back contact, lead 78, wiiiding of rela-3, 249 to battery. Moreover at armature 12 a circuit is preparecl (@xtending over lead 88 for relay 576 ,tnd at armatures 13 a-nd 14 the in'65 coming putse leads from the r'egister translator a@e connected up. Relay 249 operates when its circuit is completed and at ,trmatlire 1 252 disconnects eartli from, lead 314 extendi-iioto fl-i iaiultil,,-Iiecl coiitacts in the bank of: wil-,er 464:,,trd coiinects it iistead to le,@-d 313 whereupon a circuit is comijietecl for the magiiet 460 of the, control s",itch CS over leads 741 and 315 to bg@ttery through relay 261. M,,tgnet 460 accordingly adva,,@ces the wipers 461@1464 one step 5 NvhereLipon a circuit is cornpleted. from earth at --trlneture 250) le,@d 309, Av.iper 462 and the secoiid contact iii its banl@:, leg d 379 ' normally closed contacts of the forced release caiieel@ key FRK,, lead 289, 'winding of relay 151 to batte@Y@ AO Rela y 249 also at arn-iattire 251 prepares a circu it over leads 311 and 312 for the relay 604, the pur - ose of -which -Will be @appreciated p in due course. lvhe n: LI-ie reol-ister translator is definitely 85 'Ual @eii into use for the test I e,,trth is fecl back o@Ter 'uh,-, test lead 3. -, 3 and is 'then extended over wiue. 363, -wiper 354, leacl 108, ai:inature; 33 and its f-roiit coiitact@ @Lrin,,ttuire 4 and its f--- oiit co-ntg,--@' , ariiiature 12 and its front con- 90 @- @@et lelci 88, roririally closed springs conL,- 011'ed by '@-81 Ni,inding of relay 576 bqtr-ei,y. ma'o Re,@,y 576 operates and at ar@ ttire 577 prepares a eireliitfor advancino; the coiitrol switeli a6 -,tri-n,,tture 5@8 completes a 95 liolding cii@cu@@t foi,,; the switchin(, relays @a@sociated thb di@-it ree.(Drdino, Zwitches over leact 418 .-to @iii-, ii'orinally closed con'uacts of the release li@e@ @RK@ ,tt ,irniattire 580 ptepares ,,, eircliit over@lead 99 for rel--ly 193 at armft@100 tiire 579 o@eiis i point in ltl-ie circuit for subseqtie-Li'Lly @clvaii-ing the, control@ snvitch CS tt armatlire .581 io@i-,s itself; up t6 earth on leltd'88, at armature 582 prepares a cirduit 'L--r.rel--37@601, at irmi:Luro, 583 opens a point 105 in,,iii,,tlternative locl,-i--,ig 6ircuit for @elay 624, ind at ariiiature 584 opens a point in the energizino@ eireliit of this rela@-y. Relay 151 on enei-,o-lzlug iii i-espoiase to the con-ipletion of its eircui'L,@a@lu;,,irmiture 152 connects relay 253 110 over 16.tds 79,0 and 80 to the pulse ledd 374 of the register traiislato@ uiider test, at, armat Lire 153 coinpletes a circuit over leacl 722 f6r the forcecl release test lamp 266 and prepar'es a c,.r@uit for:the fo@eed releas-I test --fltillire lamp 115 267, at arma'ulire 154@ p-epares a locking eircui+. over lead 70-0 for i-elay 255, tt arinattire 159 coiine&us earth pulses at 65-second iliter-%7als over leads 281 Ind 739 t6 the lower windiii,-; of relay 255, at armature 155 opens,-. p6ilit 120 in@the eire@iit oL r,elay 601, at arm-ature 156. closes a point in the eircilit of relay 173, aiicl at ,trmature 158 closes@ ailother point in,tlie circuit for advancing the coiitrol snvitch CS. The circuits rem,,tin iii this condition while the forced release featiire of the register tr"leslatot is test,ed, tliat is to say, the - fe,,Lture by wl-iieh the re@zister traiislator is released ,Lnd rettirnecl to comiaioia use in case no - (lio,@its ar esentintoitwithinapredeterminedperiod
[4]4 1,745,039 after its seizure. This operation is brought about by ttie connectioii of low resistance battery to the ptilse lead. Accordin(rly when this batterv connection is made in due coui-se, relay 253 is operated over lead 720, and at armatlire 254 a cii-cuit is completed from earth at ai-ntattii-e 577, lead 280, froiit contact and arm,,tture 158, lead 'i 351 front contact and armature 254, lead 305, ia-iiidiii(r of nia-,iiet 460 to battery throti(,,Ii i-elay 261. The battery condection iii the re(yister translator is only L-1 momentarv so that relay 253 de-ener-izes after a shoi-t interval aiid opens the above eiretiit at armature 254, whereupon macnet 460 releases aiid , tdvances the wipers 461-,464 one step. The ell-cu,.t of relay 151 is now opened and it deenercrizes, thereupoii completing a zn circuit for relay 601 -which extends as follows: battery, -,vindlli,- of relay 601, ai,mattire 600 and its back coiitact, lead 766, froiit contact and ariiiature 582, lead 76i', lead "00., ariiiature 155 and its back coi-itact to earth. Upon the operation of relay 601. ,it ariiiature 602 a point is opeiied in the circuit of relav 598 and t(5 at ai-mature 603 earth impulses at tfie rite of 20 per second are coiinected over armiture 606 and its back contact. lead 311, froi-it coiitact and armature 251, lead 312, lower -",Indintr of relav 604 to battery. Relay 604 is a t30 two-stel) relay and at the end of the first impulse operates to transfer the ptilse lead at armature 606 over lead 410 to the - windijig of magnet 404 and thence over lead 315 to battery throu(rli the supervisory relay 261. The n B relay timing switch BS is accordiii(,ly set steppin and contiiiues to do so until th@a bove traced eiretiit is opeiied on the deenergization of relay 601. This will be effected when relay 576 de-enercrizes diie to the removal of .4o earth froni the test coiiductor of the reoister el translator. Upon the de-ener-ization of ret-@ lay 601 a circuit is completed from eartli on armature 602, front coiitact and armature 608, for relay 59S, aiid this i-elay at armature 4,5 600 opeiis another point in the circuit of relay 601 to prevent it re-eiierolizincy subsequentIv, and at arniature 599 coiinects eartli over lead 411 to w-lper 405 of the siviteli BS so as to liglit the appiopriate lamp to indicate the 50 release time of the B relay. It -will be understood that after the re-ister traiislator has been rele@ised due to the f orcecl ielease feature, tfie eircu:it for the B, oi@ release i-elty, will be opeiied ind it will de-enei,(Tlze after a short inli5 terval. Wlienitfinallvfallsawaye,,irthivill be removed froiii the t@st conductor aiid consequently the position in which the switch BS is broiiglit to rest is a measlire of this time interval. In case the B i-elay releases too Go quickly, wiper 405 will be en(yagin- either the second, third, or fotirth contact in its bailk aiid a e;rcuit ivill be completecl for the fast 1,,tiiip 407 over lead 744, lea,,l 288 ancl. tlai-oug-h the alzti-m relav I i-I to battery. If the B relay G,3 is 1-cleasiii(,- properly the lamp 408 will be lio,,hted to indicate this fact while if it has held up for too loug lamp 409 will be lighted the circuit of this lamp also extending to battery tlirotigh relay 171. Upon the release of relay .576 a circuit is completed from earth, front contact and armature 250, lead 309, 'IO wiper 462 and the third contact in its bank, lead 456, back contact and arniature 579, lead 4511, interrupter contacts and windin(, of magiiet 460 over leads 741 and 315, to battery 75 througli relay 261. Consequentl furtlle y the contro I switch CS 's advanced a r step and in the position which it now occupies a circuit is conipleted from earth, front contact and armatiire 250, lead 309, wiper 462 aiid the so fourth contact in its bank, lead 378, normally closed sprin-s of the series test cancel key zn SEK, normally closed springs of the key CHK, lead 293, upper winding of relay 160 to battery. Relay 160 is accordingly oper- 85 ated and at ai-mattire 161 completes a circuit fi-oiii earth, bacl@ contact aiid armature 199 leqd 729, resistance 270, back contact and arniature 244, lead 721, armattire 161 and its front coiitact, lead 80, wiper 356, wiper 365 90 to pulsc@ lead @174 tlius again seizing the register ti-aiislator. Moreover at armature 162 relfty 160 completes a locking circuit for itself, at arn-iature 163 li-hts the series test lainp 263, in -Lt armature 164 aolain completes a circuit for 95 n i-elav 576, aiid at armature 165 completes a eire@iit extendiii- over lead 284 for relay 193. The routiiier will now send in to the register translator under test a certain test number i%,h;cli has previously been set up on the in- 100 put keys the correspondinty output being set tipontlieappropriateoutputkeys. Sineethis is to be a general routiiie test, the exchaii-e code portion of the test number will need to be one which produces similar translation in 105 all the groups of re(rister translators. The n test now to be considered is made witli tlio i-esistance 270 in series with the pulse lead, this resistance conveniently having a value of 750 ohms. 110 Returninu now to the detailed operations, relay 193 operates wlieii its circuit is coinpleted and at arniature 194 ot)ens a point in the homin- circuit of the sen(ling siviteli SS, at armature 195 prepares a locking ciivuit 115 foi- the two-step relay 190, and at armiture 196 coiinects up pulses over lead 732 at the rate of 7 per second froi-n springs 278, back conttet and arinattire 248, lead 732, armature 196 and its froiit coiitact, arinature 191 and its 120 back contact, back coiitact and ai-inature 204, loiner winding of relay 190 to battery. Relay 190 only operates its'li,,ht sprin- 192 on the first pulse and, when the pulse eiids, transfers the I)ulsing circtiit at armature 191 over lead 125 292 to the ma('net 403 of the sendin- sivitch. This accordin-ly advances the wipers 401 aiid 402 one step, whereupon a circuit is conipleted froiii eai,tli on the multipled contacts in the bank of wiper 401 and said wiper, lead i3o
[5]1 7 45@039 742,@lead 302, windiii(y of relay 197, lead 704 0 t.o battery thiough refay 261. Rel ty 197 upo@ opera.tin-Y at @rma@ure 198 -c6iiipfetpp: a @eiicult ove;letd 305 for @the ni@@net 460 6f the control s itch CS at armatiir6 169'iem6@e@ IV d@Ir .@ i ect, earth froiii the @iilgiii, le@d.th-Lis rei-novino- tlie sliout.c@iicuit fr@'m sp@iii@-s.27,6 ivl-i ch are operatecl @t ihe s@l@ie r@te as springs a,i-id qt ar e@:200 @eiiiove's the 'short MatLir @n -s 277 @th I o 0circuit f@oin the sprino u(yh this''i@ ivitholit6tlect@atthepr,-@@enttime. Iinpiilses are accorclino-ly se--t iri ov@r P-til@e 1; th6 reuister ti-anslitor and the'sen SS is aclvanced 6ne stei) for each stepping continues i co et@d 15 @infil a eircluit i -Lor relay 201 a@ follows: earth 'Y@ri er and the four'th contact iii its bank lead 380 prings of the ol:)er,,tted firsf c6de input l@:ey; d'ss6.c;lated c6,nt-,Lct in the b-,i@k@6f wil)er.402 a@d said -",iiDer, lead 316 low,er winding 6f relay @20 201 to, batt@ry. R61ay 20'1 upon o@er@ti@(y, at armat-Lire 202 co@mpl6tes @ @esto@in@y c@rei;l'i for the @,itch SS Nvher by,the -v@ipe@s 401 and s 402 are returned -a@toinatically tc, n6rmal,'at re 203 c6m@l@tes a l'ocking, elreilit for 25 armatu its6lT and opens th@ 6i@6uit of, maonet 460 whereupon the -@vi.p6@s.of ih@ Coiitroi@s,@@itch are acivanced one stel), at arli@atii@e @04: opens the ci@cuii of relay 190 so that this telay de3o energizes, at armatii@,e 205 short-circuits si)@ingrs 276 to preve nt al@y furth 3r iiiipulses @- eii,ig sent into the @el@ister translators, I @t armature 206 short-circuits SI)rino,@,s . 277 this operation is'with6@t e:ffect at thi@ repari.-s h6lding 35 ti@on'e,-and at armatur.e 207,p circuit for itself 'whicli Will' iiot come i-rito us6 atthe I present time.- When'the SS ha re,,ich(@d its norriial positioii, the circuit ot@relay 197 is opeiied and it d6-eiiergiz@s, thereby 40 ao- t-lie lockinly eire@it for @elay 2'01. openl] This (1@- ei@ergizes in its turn after a slight inf terval and conditions arp- then set @up. or sen di-.ig tIlLe secolld cocle input diait, th6 onl@ diferen(,e being. that i@ice -1 @@itch f s the contro 4 CS has bee@@ aclv@iieed one ste'p t]@6, @6c6nd 5 di it is under the coiitr'ol of the, se@@ond'set of 9 Code iiiplit ke@@ inste@d of the first set. The seconi--l code dio-it is,,th6@6f6re seni in t6 the regis@er transl@t,o@ and the''Coi@t@ol@@@vitch is ,5o advaiieed 6ile step -,s before. Since the 66iiipi.e@le exchonge,cocle has now b6en set. up, the regi-.ter traiis I lator sho@ld ecimi-nence to s ex6hangc@.ou@p,ut @lia e.nO, the corre it is arranged tliat, the send[i@o@ in@ 6f any, f u@r 55, th@r di,,)@its is clelayed until'6ne digit'has- be6 receive@-I back@ froija-, th6 register, , 'translator. "'his del,,t- ilie se6 is effected loecatise afi@r.' 6nd es f over lead 79 in 594,.prepar t lamp signal cas6 no pulses are r6c.6i@,ed, @t @rmature 595 aliers th@ circuit of i@61a@ 193, and. @Lt. ar 'ma'rcuit tures 596 and 51.)@ pi6@are@ ei s@for operatin@ @6l@y 2.56 io i've@ an @larm. TO d Consi ering 1 ,ioiv tiae r6c6ipt@of linpulse@ o@t,,tlie @oiitin@i, it iiiay b6 poiiited olit that 6@ @h6 op6r,ation of.rela@T,5i6 a eir'cuit is eted foi relay, 46 as follows: batter:y@ ul, CO winc i65 iead 97 normall@ low [i@g of rei6y clo@ed spri-iig@ co@trolled @'by ArD@ature 215 i.eICI 9@,,@ i4 .1@d it";; ft6nt c6iit@et, lead 103 wip6l- 352, wiper 361-, lead 371, sei@d1'.@(y loop in the'reo-iste@ tr@aslator loa,4 372 vrper 362,, wiper @63, lea,d 1] 06, froiit con'tact' 80 and arim@t-Lire 13 lead 89, norinally ciosed sbriiis @6nt@ollecl by arn@at-Lire 2i4, l@ad 96 upper winclino,@of @i6l@y 465, leacl 83, b@ac'IK c@ntact a@d @i.Zature 47,.I, le@cl 455, arlnatlire 578and its' fri)@@ cont@et, lead 763, lead 418, 65 normall@ closed conta6ts o'J, the key R,K tb e@rth. @; Relay 465 is eiierg@zed in tl-iis 6ir@uit eir@ from e@@tli, ai@d d6nilil6te@ -1 cliit :itendin,& e back c6n,talet.,alnd armatlure 155, aiiiiatlire 1116 and its back coiitact lead 1)90, arm,,tture 466 and its fronl@ cont,,tct -v-@indi@g, of relay 467 to battery. Relay 467@upon eneroizing, at arn-iatur(@ 468 prepares a,p,oinf in ih6@bii@cuit of seri6s'r6lay A70 @ncl. at a@m@fiir6 469 opens a p6int, iii fi@e 6ircuit o@L-' relay 173 6@teiiding 95 oN,e@ 16- irans . VhenimpLil@es are iiiitted from the@.reaister: tran lator, 465 reS-@6i-ids and. upon ea6h de-eiie@gizatioil comipletes d, eireiiii throii6-h the - v@inding of r@14 @y @70, arii@atiir6 479 anc7'its back c6ntae't, -wind- loo ing of rotary n,.la@net 481 to batt6ry. Magn6t 481 accoidiiikly oper.ate ii.ite@mittei@tly and advances the. - @vipers, 482-484 n-Limber of steps corresp I ondin(r- to the digit sent 0 Lit. Relay 470 operates in serie's -v@ith th6 105 and at a@mature 4@l collapletes circuit for rela@, 472 wliich is sloiv to re'l-e as6., @Vh6n rel@y 470, d6,-eneroizes at the end of the series of a circuit is moirie@t,,trily coih 1)leted from earth, @,ri-nattire 471 and 'its bacl@:1 110 'contact @rl@ature 4'@'3 aiid it@ front contact armattire 478 and@ it b@c'k coiitact, lo-wer s -winding. of re,la@ 475 to lbiitteiy. Relay 475 now @perates it lity-ht;arw-atute,,477 and WI-ten rel@y, 472 falls a@@ay, opera@tes fully, there,- 115 upon,at armature 4T.6 preparino! circli-it I-or the'succeedin- s-v@,it6hino@ reliv 486 at armati:,ire 478 trailsfe@ri@(, @ts: in@tial e@@rgi_ ng :rl eirciiii io@ti-li@ relay, 6t armlitur6 479 pre@@,ti@ino, the 6ircuit 6f t,he rotary, mag@et of the 120 iie:i@ miiio@ s-@ltbli, a@d at, arlu,,tttire 480 conipl@ting a cir cuitover,w, . Lper '483 for the ! @corinput di_@it has be6n s@ent a lockino,'Ci@@@iii is r@sponding indicati@a laili'lli, t,liis circuit exS.- completed for @ the @elay, 2)01 a foII6* iendin@y to battery otv6r ihe 6pd@at6cl con-@ 60 battery, -Lippe,r I windiiio,, of relav 261, f@o@t@ tacts, of th6- correspoildino. 6utptit key. A 125 coi@?cact aiid armature 207, arm,,@t@re 189.anA circuit iis. al b@ nov@, c6iiipl6t-e@d from @ an inter7, its back contact, leELd 294 l@ad 382 @siith c6n- rLi@te@'-pr6viding,2!0 e-ar,ih ii-ii@iilse@s a,see6ild tact in the banlc.of,wiper 461 :,ind s@id wip6r @-wi 82 .,ind -the co@ta@@ whicli if is engag-, ng to eairth. R61py 593. is a -o operatecl at this rated . coi-ita6ts ID t -.ie cidrrespondiiig fit 4 ve, -ng @a at @rmature .,5tit@lit.@ke@,':Iead 200,@-a rtiaturo, 186 130
[6]11745,039 and its back contact, lower Nvinding of relay 182 to battery. Relay 182 which is a two-step relay now prepares a lockin" circuit over its light armature 194 and at the end of the first s pulse pulls up fully and thereupon at armature 183 removes eartli from lead 297 extending to the bank of wil)er 554 of the pause timing switch PT, at armature 186 transfers the pulse lead over armattire 181 and its back io contact, lead 296 and wiper 553 to the magnet,555 of the switch PT, at armatures 185 :nd lflolrprepares locking and energizing ciruits relay 177, at armature 188 completes a marking circuit for the first iiumerical ti input digit in the bank of wiper 402, and at armature 189 opens the locking circuit of relay 201 so as to permit sending to continue from the routiner. Magnet 555 iiow, operates from the pulses to advance the wipers 20 551-554 over @their respective banks, while after the usual pause the second code digit is sent out from the register translator tinder tegt. As soon as the first impulse of the next series is received, relay 465 de-energizes and a circuit is then-completed from earth, back contact and arinature 155, armattire 176 and its back contact, lead 290, armature 466 aild its back contact, armattire 468 and its front contact, lead 289, front contact and irmature so 187, lead 299, wiper 551, lead 291, armature 179 and its back contact, UDT)er winding of relay 177 to -battery. Rela@ 177 accordingly operat4es and at arniaturp- 17S applies eartli over lead 317 and wiper 552 lor lighting the arp corresponding fault lamps in case the patise shotild be incorrect. For instance, if the pause should be too slio-rt, wiper 552 will not at this time have passed clear of its 13th contact, and a circuit will be completed fot 40 the short pause lamp 558 to battery througb the upper winding of relay 612 which thereupon operates to give an al-,trm in a manner which will be more f Lilly described subsequently. Similarly if the I)ause is excessive 45 so that wiper 552 has reached its 24tli contact a circuit will be, completed for the long lan,ip 559 through relay 612 as befoi-e. 177, moreover, at armature 179 opens Stial energizin- cireiiit and prepai-es a '50 circuit extendirig O-t,@r lead 726 for the relay 2287 at arniattire 180 locks itself up over its lower windinly to earth on arii-iattire 186, and at armature i'81 opens the pulsing circuit to the magnet 555 of the switch PT so as to bring this switch to rest. In case, however. the pau@e between the first and second code digits lies within the peri-iiissible liniits, no circuit is completed over wiper 552 and the test oceeds witliout interruption. 4W Wtr en the second code di(yit has been re@eived from the register translator, relay 486 . 'laT functions to is operated to perform simi re!la-y 475 including the licyhtino, of the lamp &" tn mrrespondin(y to the digit received. Morea circuit is completed from eartb, armature 487 and its froiit contact, lead 123, lead 702, operated contacts of the key GRI@C, lead 701, lead 86, back contact and armatilre 169, lead 734, back contact and armature 231, wind- 70 in- of relay 208 to battery. Relay 208 thereupon operates and nt armature 209 a circuit is completed over leads 126, 76 and 111 for the loop reversed lamp 556, at armature 210 anolther point is closed in the circuit of relay 75 2-22, at armattire 211 eartli pulses at 2-second intervals are connected up to the two-step relay 258, and at armatui-es 212, 213, and 216 circuits are prepared which only become effective during tests on the 10th group of reg- 50 ister translators. Moreover, at armatures 214 and 215 the connections of i-elay 465 to the sending loop extending to the register translator are reversed. Reference to the aforementioned application will show that the 85 effect of this is to cause the operation of a polarized relay in tlle register translator Which thereupoii holds up a further sending until it is released. Two-step relay 258 operates fully in due course and at armature 260 90 transfers the pulsing lead over lead 736 to relay 166 so that after a further interval this relay operates fully and at armattire 168 opens its own energizing circuit and at armature 169 opens the circuit of relay 208 where- 95 tipon this de-energizes and reverses the sendino, loop back to normal. Consequently the sending of the remaining digits from the re,-ister translator is now resumed and takes place in the usual manner. When the full 100 six digits set tip on the input keys liave been sent into the register translator the control @witch CS will have advanced to its 10th position whereupon a circuit is completed over wiper 461 and lead 452 for the upper 10'0 winding of relay 593, whereupon this relay again operates with the results previously desen'bed except that no circuit is now completed for maintaining relay 193. The effect of the de-energization of relay 193 is to open 110 the pulsing circuit for the magnet 403 of ihe sender switch SS so that no more impulses are sent in to the register translator. Moreover at wiper 462 the initial energiz',n uit of relay 160 is opened and this 115 e're re fay is now held energized dependent upon armature 474 of relay 500. In the nieanwhile the reaister translator continues its sending operation and the two-step i-elays similar to relays 475 and 486 are operated in 120 turn at the end of each digit to ti-ansfer the various control circuits to the relay and minor'switeb corresponding to the next digit. As each two-step switching relay is operated, the appropriate lamp of the set associated 125 with the minor switch will be lighted, the circuit for each lamp extending through the operated contacts of the correspondin- outr, put key. When the last numerical digit in over, upon ite operation of armature 487- has been received, relay 500 operates and
[7]:1,745 Oli)@ 71: ai arrnatilire 501 prepar6s fi:circia@t fo@.relay 56i over leads 453 and,454,: a@t trl'na.iui!@ @602 locks itself up, aiid at',@,riA,,itiire 503 opens its iilitia;l energizil-ig @ireLlit.@ M6reover at'@ ari-nature 504 tl-ie circuit of the@@:,issociated r6ta@y magiie,t is@op6@ed to pt6@6nf alny f-arther oper,,ition of this@-magnef, an-d at armat-Lire 4-74:tli-e- locking eireiiit of 'i@el,@y:160 is openeci, so tl-iat it de-6ii6rgizo@ and@at arma-@ tlire 161 temo@ies@ eartli from the p-Lilse@lead 371 ex,LeiclinLy to the re@istei- ti-alislator under test thereby effecti:no,, th6 rolea,-ze of th.is register. Moredver 6wing t6 @th6 @fact that the eirellit of the last indicating lanip@exte@ds @o b,,@ttery through the windiii6, of @releiy 616 t@ instead of clirect, this' r'el,,L-v is o-Derat6d at this tin-le. Thereupoii at cqrmat-Lire : 619 @it prepf,,res a, lockino,- circuit for relay 629, at arn-,I,ttiire@ 618 connects -Lip earth pulses at 4second intervals @ to @ tlii--, r6lay- at armtiture 617 opens a point in -the'eitcuit'for@adv"tn6ing the @coiitrol s-wit6h'CS fit drmature 620 bpens@a Poiiit in the alternative circuit for rel,ty 576, ancl at arm:itl!re 633 opieiis a poiiit in the alteriiative eir-cuit f6r relay 173. Retl,,re lay 629 -first operates only its light ariiia 631 ana it the end @6f the first pulse at arma-, ture 630 tr'ans-Lers:th6@-puls,e I-ead o%Ter leads 771 @ and 7@( 2 to re!av 624 so @ that this r6liy 3o operates @iii, diie c6iirse, therelipon at aripatures-627 and 628 it completes a eireiiit from earth thr6Ligli the, - y@indino, of-relay 621 over lead 457 tind over th-e lower wipers and banks 6i @all the iniiibr snvitches to Cl@e@ir tespective reiease magnets.' Morebver, tt a@rriiature 626 it locks itself up to earth 6v@@r arrn@itlire 619 aild @,t tr I mat.,Lire 625 p@epares a pbillt , in the eircuit@ for stepping), ttie control switch. The variotis minor switches ar-e now' released by tl -ieir asso@iated magnets and rel,,iy 621 opei-at6s in series therewitli and ,tt:armat r 622 u e completes I a holdin ei 9 -rduit for relay,616 aid at armature 623 lights the niin6'r switch re 7 lease alarin lamp 561. Relay 621'is Oiiergized -,fs. is long as any of the switelies are I , off-n ormal iind E;ince telay 616 i @sl6w@to,@relea it is se maintained for a shott Interv@il @after rel@),,y 621- cle-energizesi@ @ Since, r6la@@ 62,1:is locked -Lip deperdent ut)on rel,,tv 616'@and is also sl6w, @elay 616 fe@lls @ away a eir 5,)@ t6 @release when ciiit is inoment,,trily c6inpleted as loll'w 6 se,,irth ol@erated coriLta6ts 6f th6 , @tart k ey SK) iiorn,ial contacts of- the release key, RK, lead 4-16, arinat-Lire 625 lincl'its front @contact, back j- cont,@Let ai@id arm:iture 617, le,i.d. 364,'armatiire -2l,) alid its ' badl@ cont,@et, @@@6k: colitqct and armature@225 a-fmattire 220-a-nd it@ backcontact lead 305, -windiiig of iiiiikn6i 460 of coi-itrol@ 'switch CS ove'r -16@ds 741 al@ld 313 ro to bat,teiy throu&hl relay 261 as usual. M, ,tgifet 460 therefore6 o@eraies to Ad;vance wipers 401-461 inclusive a further ste Iii this poP. sition of the control switch a eircuit@ i completed fr6m eartli front c6ntact @ and @a'rmaci 3 ture 250; lead- 309, wiper 462 and the Ilth c6iitact inlits banli: lead 377@ iiormally,closecl s@rings of the key SI-IK,. normally closecl springs of the key Cti l@-, lead 308, Nvinding of relay 242 to battery. Relay 24:2 iiow 6perates and, at arinattire 243, opens the circuit exitending 6ver lead. '@27:o tlie,series test 70 lpmp -9(33 ancl li-ht@ the sl-iiiiit test lamp 274:, at ar-n-iatiire 244 clisconnectg the pulsing 8prin@s 270,@ aiid @a@t @armattire 2415 connects iii) iiistead -springs 277 which are pei@,ted 0 at the rate of 14 tilses per second. Morep over, at armiture 246 a leak@ resistance 271 -wl-iieh inay have a'valtie of 50,000 ol-ims,is I connected up, @t arniatlire 2ri a lockin(@ eircuit is completed for relay 242, aiid at arii@a-@ 80 t-Lire 24-8 a circuit is also conipleted over lead '728 'or tl e lo er- -wiiidiiig. of relay 160 @and@ I w ally the same reOwing to the ck 6oiitact @ and lead 8o to pulse le,,id 374, the register trhr@slator is@again. seized.and pi-epared for ope@ation. The ,ame, input code and @n-Llirerical digits-@ tre no'%V sent in@ to it but as@@alre,-,Cty pointecl 90 out irflpiils s re n6-,,v tt t l@ for iiie a ast6r raie, stance l@t iiil@tilses p6r, see6nd@ @-and a shulat resis-taiiee is e--5-nployed inste,).d of the serie's regist,@ne. @ 2@O @s in the -p-evlolls t6st. 0 @n the coil-apl . et@on of the ir,,tnsmissioii of elieli 95 inp-ut di 0. it, the control switell is adv,,tnc@@,t on6 step as pr'eviously described::,tnd,@Nvheii all the digits have beeni sej-.it i-t is aov,.tnced to its 17th p6sition@iii v@hich a eireiiil is c i-n 0 ple.6d for, relay, 5900 as,before. The sw;.teli 100 wtlits in tl-iis posit;.oii until@,ill th-,,traiisl,,Lted digits have been ser@t oot I froii-i the ieo,ister transl.ator uncter tiest. wl-.erei-ipon relay 616 is OPeratecl and @the eircliit previ6uslytr@eed -i is 11 for.;iD-agnet 460 6f the contr6l skvitel o,aiii 105 co,mpl6ted when the miiior s-wi_tclies hove i-eleased. When the con irol @witch is advancecl@ to 18th p6sitioil@ a cii@cui' is coi,.ipleted froill etrthover Nvip6r 461-.and the 18th c'oiit-,t L'@iii its:bank, leaii 105, lo-",er wiiidi--qo- of Slow 110 relay @ 15 to batterv. Relay 15 accordill@rly I opei;ates and tt arin-@tture 16 o@ens the eire'Llit for relay I *hi6h t@herefore de-energizes. Thereiipon at a@mlture 3 the circuit of rela y rel nu oi7er leads 705 115 10,.,,)nd Oi @l 249 ektendii y and 78 is opeiiecl, ,it@,triiiatLire 4 the test icaci cli,@coniiected,' and at arn-iature 5 t@lie Cirduit Is over t,lie alixiliai@.-@ test ivil.-)er is openecl. k bm, nel@ of the ci--,ctiit for enero@izii-io- reltv 15 @n zn also, extends over @ tl-ie norm,.tlly elos'-'d coii- 120 tacts'of the: coiitiiiLioLis ro-utire kev CK, ioaci 112- arnlat-Lire 56 aiid its:froiit coi-itact',, front wincl, coi-i,t@et aDd ,trmature 64 lecid 1151 II-ig, of rna,,net 367 over leac@,s'@740 and 3@5 to b,,tfrel,,ty 261 as Li ii 1. This,.ci@cuit 125 tery.through s a is opened when the oontrlol swit6h CS reacl@i-es iiormal position after its:hoiniiio@ moveinent was started by the de7energiza-t@6n of rolay 240. @ Accorclingly the switch R.Di is advaiiced one step to connect tlae riDuti..Il.r i3O
[8]8 11745,039 f-hrotigh to the next re(rister trftiislat6r wbich t', has previously been seized ,iiid lield bu@y while the test just described -,i,as ttl@iiig place. This re-ister traiislator is then subjected to the same tests as have just been described and when they htve all been successfully completed relay 15 is a,,,aiii operated aiid the switch RD1 is advanced a further step. This continues tintil the switch RDI ad io vances to its 25th set of cont.,tcts to test the register traiislator accessible fron-i that position, wliei-eupon t eirctiit is conipleted as f ollows: eartli, wiper 3@-)7 and the secoiid contact in its bank, lea(l 118, wiiidin- of relay 1.5 63, lead 116, wiper 366 and the 25th contact in its bank, iiidicatiiig lamp 369, lead 82, armature 228 and its back coiitact, lead 7i', winding of relay 'E')5 to battei-y. Owing to the operation of relay 35, wlieii the eirciiit 20 for relay 15 previous@y ti-ace(I is completed at the end of the test of this particular re,-ister translator a bi-aiich of the circuit extends from lead 105, normallv closed coiitacts of rotitine k@ the continuous y CIC, lead 112, front 25 contact aiid arniatlire 36, le,,td 114, winding of rnagiiet 359, lead 315 to battery throuril relay 261. The wipers 3@.@1- 358 of the group distributor GD are therefore acli,anced oiie step to connect with the register distribtitor 30 RD2 (not shown) wlieretipoii the same tests are carried otit on the i-e(yister traiislators accessible from the baiiks of this switch. In the arran(yement shown, since two re-ister distributors are assumed to be necessary for 35 the first or ABC group of re-ister translators the retrister translators reieliecl from the switch RD2 will be in the sime - roup as those which have been considered. Since as already pointecl out, in a -eneral 40 routine test the test code employed is one which will be tianslated similarly by the re-ister translators of all groups, the operation is precisely the same when otlier -roups are reac,lied, hence no det-,tiled description will 45 be (,@iven of the aettial testing opei-ations which proceed in precisely the maniier described iintil the teiitli or 0 i@i@otip is i-eacbed. The i-e(rister transl-,Ltors of this gi-otip differ from those wliicli h,,tve jtist been considered .5o in that since they are tal-en iiito use in response to the dii.Iliri@-, of the diu't 0 iiot follo 'I wed bN- any f iii@the@ dialts they i-nust be arranaed to start their seiidiii(r operation as soon as they are t,,iken into use. Coiise5zi quently in this case the rotitiiier need not be arraiigecl to send in aU particular dioits to the register translator btit oiilv to slmtilate the ec@iditions correspoiidiiio, to its seizure which is done b3, reversincr the leads of the GO FiuIsing loop. Acttially there are no separate register translitors forinin(r the tenth grotip btit certain of the re(rister traiislators accessible from otber levels ai-e multipled also to the tenth level but witli the otitgoincy pulse C5, leads reversed. Hence the testing of the socalled tentli grioup of register translators is strictly the testing of special functions of register translators which have already been tested as regards their ordinary functions; for this reason the forced release test is 70 omitted at this t'me. These register translators which start sendincr as soon as they are seized are not all precisely similar but are divided iiito two groups, which may be termed 0 level regular register translators 75 and 0 level barred register translators. These latter are only accessible fi-om particular substations, for instance pay stations, which are not entitled to set up long distance calls for which the assistance of an o@rator 80 is obtained by dialling tlle digit 0 . onsequently if a subscriber at one of these stations endeavours to obtain access to the toll operator l@y diallin(r the sincyle dl(,Yit 0, the n call is rotited insteaa to a moiiitoring opera- 85 tor who explains that the subscriber is not entitled to make long distance calls. The par. ticular codes which are necessary for routing r5 a call eitlier to the re-ular toll operator or to the monitorinl,, operator will necessarily be go different fron@'the normal translation of the geiiei-al test code, but in order that the general routine test may include the tenth grou without f urther attention from the attentaiit, it is arran-ed that a test is made of the 95 correct receptioii of these codes irrespective of the position of the outptit keys so that these iiiay be left in the position corresponding to the output number of the general test. This is shown more clearly in Fig. 7. 100 The 0 level register translators are accessil)le from a sel)arate register distributor RD14 of which only wiper 360 corresponding to wiper 366 of switch RD1 is shown, the circuits over the otlier wipers being precisely 105 sijnilar to tl-lose of the switch RD1. When the groui) distributor GD operates its wipers 'nito engazenient with this special register distributor a circuit is completed from earth, wiper 357 and the l@5th contact in its bank, 110 lead 119, windin(r of relay 66, lead 130, wiper 360 and the first contact iii its bank through contacts of relay 59 and the corresponding iiidicating lamp to battery. Relay 66 ilpon operatin-, at armature 67 prepares a circuit z@, for the stepl)ln,- niagriet 368 of the register aistributor RD14, at armature 68 completes a eiretiit for relay 71, at armature 69 ap@lies a-n a(lditional earth to the motor start ead 23, and at armature 70 connects earth pulses 120 at 25-second iiitervals to the relay 255 for a ptirpose whi(!h will be described subsequently. Relay 71 now energizes and at armature 72 opens a point in the circuit of relay 249 so as to prevent the routiner sending in any iM- i25 pulses, at ariiiature 73 prepares a circuit for relay 208, at armature 74 completes a circuit for relay 226, and at armature 75 completes a circuit tor relay 233 and also for the 0 level regular lamp 272. Relay 71 moreover oper- i:iu
[9]l@745,039 9 .at6s its rem-,tining arn-iatures aiid,these complelu-e circuits corresponding to the o eration p of the various switching keys so that the routiner ma,ycon-iplete, its operation a.fter O-Tlly tlireb cocle dioits liave, beeii@,received. Relay 226 tipor, op@-ratincr, at armatures 227,, 228 an,d 229 @tlterg@the eircuits@from the output keys so that no al,,trm i's 6-iveii- if -the@corroct cliaits are rebeived even thcligh these do lo not correspond '-o t@.e operated p-ositioii-of the output key at- tliis. tim'e it ariiiature- 230 opens. a point in the circu@t; of relay 222, at ari,iiature 231 coml)letes the circuit previ - oiigly prep,qred for relay 208, alicl -,tt trmature@23@, 15 prepares a circuit for seizing the @arti 6iil@ir regyister tm, nslator Liiider test. @UI)on the ope . ration of- relay 208, this eiretit extends as iollows: ear-'ul-i, arm- ature 3 and its front contact, front contact and armature 11 , lead 705, 20 lead 301, lead 129, ari@atiire 619 and its back contact, lead 768, back contact and armature 569, lead 307, front cont--ct and a@mature.141,32 @roilt contact and armattire 219,, lead 80, iviper 356 and the 15th cop-t,,tet in its bank, 25 to the corresponding wiper of@ tl-ie s-wlitch R,D!4. Relav 2'03 @upon operatii'19, tt arma@ tures 235, 236 and 237 niakes further alterations to the eireiiit connections to the output keys as shown iii Fiz. 7 and at ariiiatlire 234 30 prepares a locking eircui.t , for relay 255. The operation of relay @-08 at this tim . at e -,rmi'uLire 209 completes the circuit of th6 loop reversecl lain 556, at arn-iature 210 close-s a point in the eirciliit of relay 222, at armature 35 211 prepares circuits for relays 258 ancl 166 which will however not be effectiv,e @ in the present case, a'u -arm- ature 213 closes an a'LIXiliary circuit -'Lor energizing relay 15, and steppin the switch RD14, -,t armature 216 9 4o comple'Les a circuit for relay 576, and at armatures 214 and 215 reverses the windin(,s-of rel,ty 465 with respect to the pulse leads of the register translator. As previolisly,pointed out, this is effective to start the sending 45 operatioi-i which noia, t@tl@-,,s -Dlace in the@usual manner. It -will be asstimed that tl-ie code for obtaining access to the reg-Lilar toll operator is 216 and hence, as may be apprecifited from Fig5o 12, if this code is correctly receivecl the apprc@priate lariips are liahted, and @t eir6uit i,,, c@iii@leted foi relay 6i6. The switch RD14 is now move,d oi-i owiiiz to the coiupletion by relay 624 of the circuit' previously prepared 5,5 by relai, 208 so that the next reg-ister t@anslator in the gi,oti is seized and tested in a p similar manner. This operation continiies until :all the 0 level regular register translators have been tested, whe.-eupoii, in the present instrlnce the switch RD14 moves to its 14th set of contacts and the circuit for rel,,ty 66 is then altered so as to extend as follows: earth, wiper, 357 and the 14th contact in its bank, lead. 119 1 @ windi @ f rel-,iy 66, le ng o ad 130, ivi-Der 360 and the 14th contact in its baiik, corres nding 'IO indicating lamp, lead 121, windino, Of relay 41 to battery. Relay 41 iipon op@rating, @t armature 42 closes a point in the locl,,ina circuit extendina over lelds 81 and @03 of @ela tn y70 255 in parallel ivitl-i that previously closed at armature 234 by relay 233 and@at armature 43 @ opens the circuit extendiii- over lead 85 of i,elay 233 tncl 6loses instead the eirel-iit of relay 238 over lead 84. Thereupon the 0 7,,-/ le-vel regular lamp 272 is extinguished and 0 leltel barred trunk Ian-ip 2'@3 is lighted instead. Moreover at armatures 239, 240 and 241 the circuits of tl-ie output ke@s are altered as shown @in Fig. 7 so that satisf actory opera- so tions shall be obta'ned in response to the digits 314 instead of 216. irelay 71 is still maintained o erated, however., i@,is relay p 226 over lead 127, and consequentlythe sendino, 6peration now proceeds in the saiiie manner as just clescribed the only di:fference beino, that the routiner is no-@v set to @eceive -tl-IE@ @OCIP, @314 instead of 216. When all the register tr@ns l"ttors@accessible ov6r the: switch RD14 have been tesl-ecl , the 90 group distribtitor,GD is stet)l)ed ii-i the i-isll"tl manner ctnd a circuit is tlie@ completed from earth, wiper 357 and the 16tli contact @in its baiik, lead 110, normally closed si)rings controlled by armature 25 @vindin(y; oL. -r(@lay, "14 95 to battery. Relay 1),4 1 the:,etipon operates "Incl -tt armature 26' o e s@th p n e cii-cuit oL@ relay 17 so that this relay de-energizes, ancl at, armature 25 locks itself u@ to the ope@at6cl.,coiitacts of the start key SK, o ver leacls.714 Ind 128. MoreolTer, at@ armature, 24" -a -eirc-Liit -is cloinpl eteci for' the test com )Iet@@l' limp 29 -which eireliit extencls over leacl,711 to battei-y throug h the alarm rel 171 ill tlio'iislial iiii-iir aly ner,, and at arillature 9,5' aiiothei- I)oint iii @th6 i L,3 orifyill al eireiiit for stepping the -i-ozip distributo r GD,is opened. , The coiiipletion Oi this circuit through the relay 171, A@ill brin"V in the alarm in due @course as ",-ill pi@esently be described to notify-the atteiid,,i,iit tli-,it tle 31' test has been cluly,@on-tpletecl. The attepda-,it - v, ill tccordingly rest6re the s'uart Ice-Y @SK and general routine@ key GRK, to normal, thereu pon,opeDii-i,, tlle l@cl@i'ng circuit of relay 24 and also t@e.eir.eiiits of relavs,@,)o ,Ind 115 48. This latter relay-; iipgn de-e'nergizi-ng, also brings do.,"Tn relavs,,52, 59:apd 61. ! As long as the gro:Lip,distributor is o+T-iiornial,,a circuit is completed over iviper 358 and the lijulti 120 pled contacts in its baiik, leacl 113 to relay 44-,a-ncl this iii . a(icitiltLilon'' toa:pplyino, eart@ from @arm,,Lture 46, 1 ' d 713 to MO,,-or e,,L 'Sta@t lead @3,,at, arma-ttii-p- ll,,3,rtepares ,t locl@- in(@@ uit f6r relay 256 ailc armatii-i.,e. 45 , eire . I @ - prepares a, eirciiit @-v@hich on the release of re1,.ty,5@ is completecl "I.S fol@lows: - e,,trth,- iinp-Lilse springs operatecl at I the rate, of 20 1)er s econd@ lead 717, arn-iature 55 and its back contict , armature 45. and, its,;front,contactl:lead 90 I @itire. 587-,and @its @c,k arm b contact
[10]1 0 1,745,039 windin(y of relav 5S@@) to I)atter@r. -Ltelav 585 is a two-step i,elav and it ti;lic olei,jil-es onl .1, its li,7]it ariiiitttii,e to tl io loc!f@in(r eir-ciiit pi-ei,ioiis-,Iv piopii-el o,,@ei- le,i@l &@, 94. At the eiid of the I;iiise opei-ates fully aDd at r)Si- tli,,@ pulsing circuit over lead 91. b(ici@ ef),l' t@,,ct ai-i(I itrinattire 54, lead '07, lead 114, oj' rr.i,,i(ynet 359 of the disti-ibiii-oi- GD le,,,d 315 i@l to @attery throti-h rel@iy 261. Accordiigly, the switch GD is acli-a-.iced step by stei) i.nto its Dorii-ial posit;on ii-liei-eii,)oli i-el.ay 44 de-ener-izes. Thereupon th,, I)rei-iousli, traced cii-eiiit froiii the iiiipiilse sprin--s ;s e-tended oi,er armature 45 an-,I its baelc coitact, f roiit contact aiid ai-iii-,It,,ire lead 1.?O, w,iiidinf, of 368, leil i'41, le,,t(i 31,5, to Llatter3,, throu(y-li i-elai, 261, so the Clstribiitor RD14 I is adva need t iiiiiiber o.' ste,)s stifficieilt to briii,- it to its noi-iiia'i I)ositioii -'Lli wliieli ))osition the cireiiit of 1-0.1@1)7 (@)6 iS opened. It will be undei,stoc,(l in he erdinary course as each its 25th position it coml)le'L-e,@ z I-elay 35 over lead 117 ancl that 'Lhe quent pulse for ,idvancin(y tl,,,e switeli GD @is -ilso effective to advtncet@tli,@ r(@gistei, disti-ibutor so tliit tliefe v,,ifl in the ordiiiary cotii-se L-e i,etiii@iieci t( t'le;l. normal position. Ili case the stai@t kev slioiild be restored ivhile a test is iii pro,,)-i-ess tite eircul 'tsjusttracedfori,estorir,(-,tliedist I to normal will becon-ie opera+lii-e i.)d ilioi@eoi,er owin- to the r,:@lease of i-el,.iv l@ tli- cii-cuit for relay I is ol)ened ,iiicl this in. tiirn brin(ys down i-elay 249 ivi.)ereupoii a lioiiiin(, circuit is coii-ipleted fo-l-, the cotitrol siviteg CS. If the sendld"y s,@,itch SS litpp,,,iis to be off-normal at this tiii-ie, it i-s i-estor,-d til)on the de-energization of i-clav 19" wi)ile the i - e lease of relay 249 @lso I)i-in",,s 604 so that a homill(r cii@ct,,it is fol. the switeli SS. The liomin,, cli-c-,i;t fc,-. tile i)atise tiji-iirA(, sivite'll Pr @s c,l),,n bv relav 182 tnd this is s@qiienie of the restoratio@@i oTt@ic, kei-. Moreover for j.-estoi-in- aiii, iiii-,io,. , whicli li,,ii,)peii to be off-n-)i-iiial , (,-"-,.ciiit is over tile noriiiql coi-ita@,@t,; of t, e start ke)T, le,,id 417, coiita(-t alifl ai-,,iia'L-,@tii-e (@,--)8 -,ind b)7 v,-ay ot. i'vin(iiii(-r ()f lead 457 to the rel.ease iiia(rpe its @tS Of tlic, i,a,,,,o switelies, tiiii-, all the app@iritiis I's to iioi-inal so tbit a iieii7 test ii,a@, I)e (!oinat on(@e if tllls is (Icsil.e(l. The fliiiet;ozi aiid iiietliod of operatioii of the relav 3iiijay be 1)oljited o,,it at tllis tiiiic,,. Aliv spare coiitacts in the biiiks of the test wipers of the varioiis re(lister disti-ibutol-s ire inultipled to(,etlier ai-id cojiziected (.)ver lead 100 to relav 37, the fiiiictioii oil wlilel-i is to advance these disti-ibiitoi-s over the@@e partictilar co-Tit-,icts so It'hat the test m,,iy L-e continuotts. When relav 1 de-eiiergizes at the end of a test on an particutar register traiislator, asstimin(y tllat the correspoijdina register distribtitor has been advanced into @n z@ eii(ya(ren-ient ii-itli a set of contact-4 to wlilc'i no re(yister translator is connected, a c'lrctiit tn %vill be coinpleted as follows: operated coiitacts of start 1,:e3, Sl@, leacl 109, back contact and armature 4, froiii coiitict and ariiiattire 33, lead 108, wipei- 354, iviper 363, asstimill(r that the cont,,icts are in the 1),,iik of the distribtitor RDI, lead 100, bacli coiitact and 75 armature 2, ",iiidin(' of i-elav 37 to battery. Relay 37 upoii opei-,ttincr, at ai.- mature 38 coiiipletes a cireiiit for i-elay 15 ;o -,Is to prevent relay I a('ain energizincy while the i-e(,,ister distribtitor is iiiov,in(r f -it ai-iiiattire sr) 40 prepai-es a, lockiiig eireliit exteiid@,'i,- on-eileads 718 aiid 94 siidilar to that jilst described foi- relay 585., tiiid at ai-m@iture 39 coniiects up the 20 ptilses I)ei- second il,,Ipulse Spl'iDgS tO t'llis i'elay over lea,ds 716 and 90. s.@ Cojisequently at the end of the first ptilse tlle (!ireiiit is ti-ansferred and iiow extends as prei-iotisly traced, tliezico o-ver le-,id 91, lea(l 706, frojit contact, aiid trm.,tture 18, lead 710, ariiiiti@,re 56 aiid its froiit coiitact, froiit s;o coiitact aii(I ai-iiiature 64, lead 115, wit)diii,)- of niao-net 3(i7, lead 740, leid 315 to battern I tlii-ou('@h relay 261. This circuit will be coi@i-' pleted as Ion(,- as relay 37 remains eiiergized so tliat. the re(,ister distribtitor is moi-ed re- i; liably over coiitacts to which no re"ister ti-anslators are coniic@cted. el The above desci-iptioii lias been te-,,iven oli the asstiniptioii that the test proceeded satisfactorily throu(yhotit and that iio conditioiis I(O ii,ei,e encotiiitered wliieli were not standard and whicli would neces.@itate atteiitioii froiii the iiiaiiiteiiiin(,e riian. The variotis indicating lamps aiid other stipervisory eqtiipiiieiit not;fi-in,@, fail'ts wliieli iiiai- oect,rw'll noii- i o,-, foi . I be referred to bi-iefly. Considerin(r fit-st the i-elav 261 to wliieli iefei-t@nce liig been ni:t(le alrea(ly. battery is fecl tliroti- i the wilidin,, of this i-elay to all the iiitgiiets of tli(,, i-otari, switches employed in ttie rotitiiiinc, eqtiij)n,ent an(I the relt3, ul),)ii ol)ei-,ttiiig. at iriiit62 coiiil)let(-@s a foi- tl)e ro',ii, I'Lire '2 switell release l@iiiij) 27,@). tlils - (-ii-(!iiit -er lc;t(l tltrotit,li tfie bein(r coiiipl.ete,l o@ iil)per i'vindip- of i-@-Ity 1-72. "i!iiilii-ly tll(@ 115 i-e!ease of tlle iiiiiioi- sw'tcl)e,., is stil)ervised by t-lic op(,i,at'on of 621 CO]III)ICtes ,I ci"cll;t fro", e@ll-tli. fi-(it coiitict aii(I tiii-c l')23, iiiii)o,,- Intl-II) 5(;j. lead 419. ',pi-ei- wiii(.Iliig of i-etan, 172 to I)at- 120 tei,.)7 a.,-, before,. Tli(, e-jr(,iiit of i"el-ll.v 172 ciii al,.5o be, coii:,.I)Iet(,d fi-ojii tli(-, ftise al,,i.,-ni b-,ii, tlii,ou--li liiiij) 265 in cise a fiis@, sliotild blolv. Relav 172 til)oii ol)eratin(,Y, at ii-iiiattire 1-2' coiiipletes t eireiiit oi-er leid 4--)O f,)r tlieqlariii 125 relay -)62. This i.,elal,- ,it triti,,tti,.re @X)3 fonipletes a eiretilt oi,-er lead 56,4 b.1, Nvay of a etitoff key for the iiiii-n ilariii. and at trmattire 56.@) completes a (.,ircu@it over leid 566 for an ,tlarm bell, The variotis al.ariii lamps, tbe ISO
[11]1,745,039 light;ing o'L Nvhich inclicates faults which have been encolintered aiicl which iiiulst therefore give an alarm obtain their battel@y throuo@lil the Avinding of relay 171, ai-id this at armature 171' completes the circuit over lead 420, for relay 561-) as just t aced, anci tlso at ariiiature 1.('2" completes ,t circuit from the release I.-e RKoverlegd4l8andlead2S7forrelay, y 612. Relay 612 iipon operating ,it -,trmatiire 10 613 dis-connects the time plilse so as to prevent the display being cleared clown, at armattire 614 locli:s up relay 591, at armattire 615 applies earth to the test lead to busy the f aulty register traiislator, aD-d at arinattire 632 comv r pletes another circuit o e lead 775 for r6lay 562 so that the alarin is brouo-ht in The regi-ster translator busv lamp 557 is to indicate -w@hen a re(yister translal,-or reniains busy for an ui-idue lengtl-i of tiiiie L-,nd is lio-l-ited upon 20 tlle operatioii of rel,@ty 573. It will be rememberecl tha'u relay 6 remains 6perated as lon,as the rotitiner is in associa-@'ion -with a.busy reo@ister translat6r and at arrqature 9 cot-inects zn .tip e"Lrth ptilses at 25-second intervals to lead 25 124. Thefirstofthesepulsesservest6operate the tavo-step rel-,iy 570 Aihich Lt armature 572 alters the circuit so that the sudeeeding pulse, if the btisy condition I)ersists, is routed to rlelay This relay there,,ipon operates aDd rip- 0 o locks Lip at a ature574tothetestlead fthe register traiislator o tlitt i.n case tl-ie 'bus.y condition shoulcl be rem6ved before the ,tlarm lias beep attended to relay 573 Nvill be de-ener(yized c-p-d l@i'lip 577 which ivas lighted at s-5 armati-ire 575 'will be extin-uished. If the., forced release f(.,attire fai-Is to operite within r -nsl,,itor ,i given iiiterval after t-he reo-ister t a is sCi7ed, the corresponcling alarm@ laml,- 1),67 is lighted. Relay 151 ut)on operating 'when 4( the reo,ister trallsl,,ttor ig sei-zed at ariiiature @n 154 prepares a lockino@ circuit extendi-ng over le,-.d 703 for rela.IT 255 and at iriD,,Ltilr6 159 i-iects Lip 65-se@ond e,@irt,h pulses@to 'Llhis recon over leads 281 il't-V a icl 739 so tli,,it unless '-he 45 reoister trapslator has been releised -kvithin a SiLiitable irterval, at llvliieh tin-ie relay 151 will de-energize, afte,- rel,,iy 25' h,,is operated ftilly the i-e-,t pu'ise ivill efvect tl-ie operation of relay 217 over arinat,,ire 257 VV'@ich will lock up,to ,50 the iiormal C6TItacts of the key RK o@,er le'tc-I 418 FLnd at ai@mature,218 li@,yht Ian-lp 267. 'As e has tlready b en point,ed ou,t, the sendino- in of digits is delayed af@cer the necessary cocle bas been tr,,iiisinitted until one digit has been 55 received bael.T from the register tr,,inslator buit should then recoinmene(@. Relay 593 is oper-. P.teci at thi@s ti@i-ne tnd completes eircults.similar to those jt,.st traqed for relay,255 so tha,t agaiii tft6r a stiita-ble 'Mteri@al relay 217 is @o operated unless in - the!meantime impiilses are received to c,,tuse the operation of relay 182. In this lease, however, lai@l- -p 267- is not operated owi-,i(,@ to th.e fa.et th,,tt relpy 151 is nonv deener 2e,,, but. inste,,id rmature 594:o ta e -ver a -utor @-, 4$ - @7 269 is li(ylited o f '@e- distrij@ GD T@ k lay 593 and lead 79. In case the register translator sl-lould start sending -when, the lo6@ is reversed acircuitiscoiiipietedfori-elay222as f ollows:-b,,tttery, @,vin(--Iina of ielay 229-, norinally, clo eo, springs 6ontroiled b@ armature 224, b,,tel@,co-Litact and armatiire 230, armature 2iO an4 its h-oiit 6oiit-.act sinc6 tel6y 208 'is ol)ei@a4ed tt this time to eff ect th6 i-e@iersal, lead 726, :E@ont contact ii,id arniature 179 since relay 1'(7 is now locked -Lip, l@ad 291, illultiplod contacts iii the balnk of @viper. 551 ancl saicl wiper, lead 299. ariii@ture 187 and its front contact, lead 283, fi@ont ecrntact and arinature 46@8@ b,,ick coiitact and armature 46 4 6,1 lead 290, back contact tnd arindttire 176, armature 155 and its,back co,-.itact earth. , Relay 222- thereup,on older,,ttes tiid at arinature 223 liglits the sendinu-0-1-i-reversed-Iiiies lam@ 268, at armature 224 locli:s itself -Lip over leads 725 aiid 418 to earth on l@ey RK, and at @trmat Lire 225 o'ped-s a. poi--@it in the clireiiit f 6r advancing tl-ie switel-i CS. If a -WrODg n-I Lii-.iber,is received for any 'di a c er ..ie git ircuit ivill be completed ov @ t iilper of the associ.ated n-iinor switeli, tlllro@igh tli6 la,iiip cori-esponding t6 i-he wr@ng num- De' ber, noriiial I contacts of the associ@ted o-Litpiit key, lead 760 for relay 609. Thereupon at @r,,iatLire 610 a -lircllit is coiiipletecl fok relay 612 ivhile at arniatiir6 611 the wrong number lamp s 0 560i lighted@ Owingtotl-ieoperati nofre- (,,5 mbe upon tl-ie pan I is not lay 61-9 the nu r set e el.eai-ed do-wn after the@-Lisual interval ,ind m@i y eia@ble 1,lhe atteiidant to loc@ Ate@ il-ie T,,L-Lilt, witho-Lit clifficiilty. It ha- already been pointed @o Lit th,,it the l@n-ips 407 and 4ID9, the eir@ui+.s 6f loo are cojiipleted OlTer I wip6r 4o5 of the s-ktiteli BS, e@ztend to batter o@Ter loads 744 y @,Lnct 288 thro I ugli the windipg of relay 171 so that iii case these lanips sl--ioiild b6 li-,@te(I the ustial effects of the oper,@tioii of relay 171 NI'lill 105 be pi@oduced. In a similkar manner lai-iap@ 5--8 and 559 as,3o-liated -@vitli'wiper 552 of the pause tliiaiiig sii,iteli I PT their batterv i-lirotigli the -Lipper Nyi@ldiiig 6f relay 610- S'O th-at if ci@l-etiits are ceiiipleted, for these l@mp 110 this is operited Nvith tlilo resilits previotisly d6sci-ibed. .@WI!6n n dlarm h,@,is once bee@,, giA,.ep-, the @tte@cl@i-it iuay xelease the o p eraLec.1 i@el@t-ys -by tlarowino,. the l@ey RK moivhlerbiipoil tlie' to'st is contintied 115 froiii the poii-it at ivliich it 'was idterrupted. g alreaclv,bee nientio ed that in case it lia n n f roup a test is onl reqtiir ed y I 9 @ of register translators t litine !,:ey is iiot operate-li 'b -.,i t iated 120 -@- ,;ith the gi,otip. , These n in Fi,,@'. 5,,aiid are iiiarli@'edw i6h nitist'b @ ditlled,to obtait orresl)oiidln,(@ o-i,oup of rebister tran@lators. As,iieref6re, th@,), 'Fh suiiie, I t t e attendant wishes to i,,5 'tesi, ti-ie @ recister trdnslators in, gro-up - 5; he !K:ey'l@ark6d @MN instead of tl-ie key GRI@ and will-then o@erate the start the no-puls6s-receivecl key "It as ii@uil. ii@ this ca@@ aft,er the groiip o '5 e 8te-P due to the 13@)
[12]l@2 1 746,0@9 'ii@uit -conipi6t,ed 'bef6re- @@l'av 17 operated, 'no circuit is iic IN17 Collli)leted f@r relay 30 but i@st@a'd a 'ei@,-'Ult for the' tivo-step relay 588 follows: I)tilse spriii,),s lead 717, 'irM-gttlt-e 5o-, and @its' front c6iitact, lead 709, bd@k c@6'ntact and arm,,tture 34, lead 95, ariiia'tur@' 689Aiid'its back contict, iipper ivinding oire6lay5'88tobattei-3,. Relav588is.therefore er I ated in d 'Ue@c'6urse and pu'l'ses are then con16 . licieted overdrmatur@ 589 and its front contact a-hdl6adll4toma(,Yriet359. TheswitchGDis ''the@eforeadvaiicedtintilwiper351eiiga(resthe @th co@thet.-in its baiik, whei-eupon a circuit i@ coin I t d f L-om eai-tli, operated contacts 1). e c i of key' t iii the bank of wiper 351 'and ad 107, windin(, of rela ay 30 operates with the scri bed, btit oiviii(r to t GR K is not 'iio-,v 'Oper'o -,Rtedhd, t is 'coinpleted over ai-- mattire te'sts on the re-ister ti-ans@,t-otip MN noni- t,,ike place as pi@e@ioiisl),'d-e@er'ib @e@cl'4@x@ept ttiat i-io test is ii-iade ;'iA thi@ iiistai-i@e for sendilicr oii revei-sed lines i@ice @tlic @@ireti.it'f the i@elay 208 -@vliich conit Mis@ltlli @ltest i-I I olii@leied owing to the Woh,6'i4ei-,ition of key GRK. 1,1/'@-iien the ftist"iegist@@ tila.11 r lias been fiilly tested, @'ttic eirellit will I)e coiiipleted for ad' @vaiqci 11 s -nc,- 'the' e,-ister di'tribtitor RD8 one @@tep, 'aii(I also foi-'ol)ei-,.ttin(f relay 15 which ol@o-n @the ci@cuit of relay I while the 'tell' i@s' @tel)p Wheii all the register tratisfilt(jr!4 accessible fi-om the switch RD8 hg,@e@be-en test6d a @c@ii@eiiit is coiiil)leted over loa(l 117 as previoiisly (lescribed for relay 7,5 i aiid this ',It @arlitattire 36 completes a eirt'Q@Ner@'lead 114 foi@ ad@,,,incinc), the switeli Wheii the s-v@itch advancesm, the circuit 4t, of ti@lai,-30 is (Yp'enecl and it de-eiiei,(rizes so tliat@ a ciiieuit is acrain c6mpleted for i-elay lo@81i and 1)ii.1s@s ',ire sejit to ma(,net 359 so tl@,l t' . ti-le s%vitch GD is stepped until wiper 357 enti,i-es@its 15tli ec)iitact. Tlie, g retipon ,t eircifit'i@@coiiipleted over lead 110 for relal, 24 ivhich locks iip 'aiid crives the test-c I oiiipleted iff@riti i n tlie inaniier- previotisly described. "It i,@ilt be iiiid6i-stood that if the gi@otil) had 1,,'I@eti'!@@ifficiently large to requii-e two i,e(,ister r, (lis@ttil@Litoi-s the circuit of relay 30 @would liiive'b@eil agairi coml)leted -%vheii the second i@)f @w'as' 'conne(!ted @vith by the switcli 'CirD' aii(I 'tlie'. fe(,i@ter translators accessible t'h@r,efl-oni ivottld litve been t@sted iii turii. It will be,' tintlerstood also. that since oiily oiie '.1)@rti@til-ar' (4i-6iip 6f 'i-egister translit'ors @is -bei-iig d,?@lfv@lih @nd thaf these are all exactly iil@r@, aiiy'cod iste tran n e whicli these reg r slitors@ @re 'arranged 'to deal witli could be Ci 64d the@ test code and 'n' ot oiily a code 4tpply to all tlio grotips as was lip t!hs46 Witli a @e'@@ral roiitine@test. It may.'t)e, d'esirable'ii@ soilie cases to make ,t 11 I 0 est. that s called ' 66 t'nuous r titine @t 65,21is t a itin@be " f n r o comp ete testi g eye'les onoiiet),,.iTt;cti.!,ii-i-e(,Ist,,,i.-ti-ai,.slt,,t,)],. -Liitlii,, case tli(,, co,itliliolis i-o,,icine 'i@Cy Cl@ is tlii,ow,@l aiid tliei) tile ke.@, coi-i,e,@i)oii(lin(@, to the 'gi-oul) -ii) )i-l-itell t'iie i,o(liscer ti-.iiis@latot- is lotted. -v'teli GD thet lltlnts ill tll(@, 7U c, The si I maiiiier jtist des(@i-ited to codnect witli this gi-oi,il) I)tit iiiitil the @-,tirt key SK is ol)erite(i the actiial test c(ijijiot stai-t. The gi-otip stel)- pin- Izey GK is now operated the reqiiis@ite iiiiiiiber of tiiiies aiid oii eacli operatloji a 75 ci@@letiit is coiiipleted froiii eailth, noriiial contacts of the key SK, oi)erated contacts of the l@ev CK, operitc(,l conttets of the key GK. lead ll--), ii-iiiati@ ts froiit coi@iact, @peri-e 5,li tnd i ate(I contacts of the relay suell as 63 or 66 8o co i-resl)oiidin(,, to the cri-oiip selected, to the lina,,rnet of tl-.e associated switch over leids stiel@ as 115 and 120. Conseqtiently this ma(,- ]let is operated eacli time the key GK is sed and the i@ (-,'ster distril)utor niay s5 pres e " i tlierefore be set into eii-a(yement ii-itli the reqiiii@ed rouistei- ti-anslator as itidicated by the li,--htin(r of the al)pi-ol)ri,,tte larnp. Tlie, start key is noiv tlii-o-%Yii whereiipon the usual seqtience of tests is cari-ied OL]t Oll this particu- 90 rcai lai ster ti-aiislator. At the end of the tests, owever. tlle i-e(risl,er distribtitor is not ' ad-%,anced oiie step as is iisual o-",iiig to the fact thqt the eiretiit of the associated ma,-net normally closed con- 95 ha-,. been oi)eied at tlie, tacts of the key CK. Conseqtientlv. when i,elay 15 de-ener(-izes io operitte relay I is able i---ain and the test is theii repeated oii the same register ti-aiislator. If desired, the gelieral roiitliie l@ey GRK iiiai, be operated after 100 t,he I)articular rezister ti-anslator lias been selected so as to enstii-e t!iat t test sli@ill I)e inade for sendin(, on ren-ersed Iiiies. The contiiiiioiis routine test ivill coiitintic iintil the atten(iaiit i.-estores the kev CK. 105 The wirin- of tl@e armatures carried by the relavs 226, 233 and 238 in as-sociatioli witli the oiitput ]@eys is slio-,vii separatelv in Fi"". 12 wliere the sime reference numerais are einI)Ioyed so that the eireiiits ma y be i-eadilv fol,- 110 lowed. It i),ill be seen that wben @ill'tlles(@ i-eltiv I position tlle connectioiis , s are in iiorma of the keys 2 and 3 of the first code oiit@)iit set, key l'of the second set ai)d keys 4 ,in I (I 6 of the tliird set are the same as the coiiiiections 1 i;i of the remaiiiiii- Ice3-s iii tl)ese, sets. Wli(@ii .e, the 0 level re(yister ti-aiislatoi-s ii' tested however, the reliv 226 is ol)ei,,tted iii(I either relav 233 or reliv 238 accol-dint, 0 lei7el regular oi- 0 120 i,e(riste,i- translators are beiiig deilt, witli. Tn the foi@mer case the eireiiits'are such tliit if the swifches are set for the code 216 tl)e corr n(r lanips will be lil-Illited to batterv a resistance irrespectin-e of the pa 125 t eu ar setting of the kevs at this tinie. Sii-nilarly when relay 238 is"ol)ei-,,ited, the eircilit.-@ will be altered to correspond to a traiislated code of 314 ,tnd a(,aiii this is indepeiident of ol @le keys. In case the required tli@ s6ttinn of ti 130
