claim: 1. In combination iiit-h the boiler of a steam, locomotive, a b6oster rnotor for the locomotive, -L tl-irottle v,,llve locitecl ivitliii, 5 r) the boiler, and means for operating -'L-he, throt.tle@ v,,,tlve comprisino- -, rocli: sh,,tft extencling tl-irough t,he wall of the boiler, oper,itilig connections betweeii the shtft and I ulie valve, and meaiis olitside the boiler for ro60 tating s,,iid shaft. 2. In combination with the boiler of a ste,,tin locomotive having a steam don-ie, a booster motor havino, a steain su ply pipe, L.-, p extending into said steam clome, a throttle 65 valve at the upper end of said pipe, a. rock shaft extendiiio- tlii-ougli the si(.](@ of the (loill(@ liai7ino- operatill, Co])Iloet'O]IS AVitil tjl(@ 17,11@7(@. and means oiitside of the [)oiler foi@ i,ot@itiii(.y the shaft. 3. Iii coiiibiiiation tlie, I)oiler oi@ :i 0 steam locomotive I)aiiii(, ,t stcaii-i (loii4e. :i, booster 1-iiotor h-,iviii(r t ,(,eaii-i siippl,), pil)e exteiidinfr iiito sild steani (lome. t tlii-ottle ive a I VI," t the Lippei, eiid oi' sa'(1 a ro(-I@ sb,,Lft exteiidiig throii,-h the side of the (loiiie 75 li,,ivin(r a ei-,ink oii its iniiel- cri(I Ayitli the stern of s,,ti-d A71,IiVe is conti(@ete(l, t (@i@@iiik oii the oii'Ler eiid if tlie, sli.-.-I't, aii("L :i fiiii(i I)resstire acti@tated deviec, coline'ete(-[ lvltli fli 0 last meiitioiied ei-aii]@ foi- rotitiii(,- sai(I slit f't- 5@) ,,iid operating tlle 4. In combij-iitioii Ai@it]) the I)o'ller ol' ii stetin locomotive liai-iii,,- i ste@iiii (loiii(@, t booster niotoi- foi- the locoiTiot@i-v7(@, ' t st(@,,iiii sul)p,ly pil)e for the booste), iiiotoi, exteii(Iiii@)- 85 into s-,-tid stcaiii doii-ie, t fittiiio- oii t.lie itl)p(,@i@ end of saicl 1.)Ipe 1)roA,i(le(i ivltl) :t monable vali,(, lia@@in-- i steiii,l t stiift@iii(,, t)ox ari-an(-ed in the sl(l(, of tlie, st(iiiii (loiiie. @i i-ock slilft exteiidin(- tliroii,)-li sai(I stiifl'iii(, @)0 t-I box and proi7ided at its ii)iiet- eii(i Avit]) it cranlc connected witli the steiii of stid N-al\-e, ,t ei-ank on the outer eiid of sii(I 1-ocl@ sli@ift" a cylii-ider iiid ]:)iSto]l tllel'eill ll',IA7illll @l I)iSton rocl coniiected )-vitli the ei-aiik ,it the oiitei- 95 eiid of the i-oclc sh.Lfc-, ,Ill(l ii-iealls fol.@ lilt,.odiieing a I)i,esstire fliiid iiito tlic, cyliii(lei, to move the I)Istoii ii-i olic (lirectioii. aii(I ,i spi@iii(" to move, the I)istoil iii tli(@ ol)l)osit(, -roe 10( d@ tioii. 5. In coinbiiiitioii witli a loCo]llotiA7e iiig a trailer triiclc, a I)ooster ii-lotor on s,,tid triiek for drii,iii,r the axle tlaej@(,of. ,Liid a steaiii stippli7 pipe for the boostei@ iii,), se6tions fixed to the boilei, of the locoii,io- 105 tii,e aiid to the booster resl)ectli-el-\,. I 1)@lir of packe(I tolescol)iii(-r sectioll'S, tiid flexll)lc,, joints coniiectiiil(, stid tolescol)illwith s@iid fixe(I sections,' 6. In combiiiatioii witli I, locomotiA-(, 110 boostei- motor to driae cc,,l-tlin @vli(,Ols ol' i-11(@ locoinotl-%-(?;. aii(I i steaiii siij)])I,), pil)e foitll(-, booster iiiotor. q I)ortioii of -Nvliieli is ()I' smaller iiiterii,.tl (Iiiri-ieter tllan tl,.e ]-es', to cheel@ the infloav, of steam to the boost(,r ii, 1 the event that said vn-lieels slil) -.Iiid the booster teiids to race. T. Iii coii-ibii-iatioii -witli t locoiiio'L-i)-c, a booster motor to di-ii,e certaiii AA-licels of tli(, locoiyiotiA,-e, and a steaii-i sul)ply pil)e foi, the 120 booster motor I)roAidecl witli meiiis Avlii(-Ii icts to cheelc tlio, inflow of- stetiiil to tli(,, booster mc)tor iii the ei,eiit tlial i-,Ie I)oost@(@r tends to race. S. In combinqtioi-i -",ith ti locoii-iot@A-c @iiid 125 its tender. the litter 1)roi7i(led Ayitli L tank, a @ooster -rnotor associated AA,Itli tli(@ locomotia-e, iiid iiieaiis f-or ilitro(lliciii@)- exn haust steiiii froiti the booster moilor il'it@o the water tank on the tencler .it @i coiist,,iiit dis130

1,395,476 tance below th'e water level thereiii regardless of clianges in said level. 9. In combination with a locomotive and its tender, the latter provided with a water tank, ,t booster motor associated with the locomotive, and controllable means wherebv the exhaust steam fi-om tlle booster while i@ normal operatioii may b(, discharged either to the atmosphere oi, into the water taiik of 10 the tei-ider. 10. In combiiiation Nvitli i locomotive aiid steam actuated booster motor associated therewith, a water tank and means for introducing exhaust steam from the booster 15 into the tank comprisinr a pivoted pipe, and a flo,,tt arranged thereon to keel:) the dischal-ge end of the I)ipe at ,t fixed distance below the level of the water iii the tank. 11. In combination with a locomotive and 20 a steam actu,,tted booster motor associated therewith, a water tank, t I)ipe for conducting oxbaust steam from the booster motor, one end of which is open to the atmosphere, a valve to control tl-ie discharge from said 25 pipe, and a branch pipe extending into the water in said tank. 12 ' In combin,,ttion with a locomotive and a steam actuated booster motor associated therewith, a water tank, a pipe for conduct30 ing exhaust steam from the booster motor, one end of which is ol)en to the atmosphere, a valve to control tl-ie disch,,trge from said pipe, ,tnd a branch pipe pivoted to the first named pipe and provided with a float which 35 keeps its discharge end at a constant distance below the water level in the tank. 13. In combination with a locomotive and its tender, the latter provided with a w,,iter tank, a booster motor associated with the locomotive, an exhaust steam pipe connected 40 with the booster motor a,-nd extending upwardly through the tender and open to tl-ie atmosphere at its upper end, a valve in the upper end of said pipe, a pull rod to operate said valve from the locomotive cab, a 45 branch pipe pivoted to the first name'd pipe, and a float thereon adapted to keep the discharge end of the branch pipe at a coiistant distance below the level of the w,,tter in the tank. 50 14. In combi.nation with a locomotive aiid its tender, the locomotive having a truck supported on normally idle wheels, % booster motor located cn said truck to drive said wheels, a steam supply pipe pro- 55 vided with t throttle valve located within the boiler, means located outside of the boiler for operating said throttle valve, s,,iid supply pipe comprising telescoping pipe sectio-ns and flexible joints connect- 60 ing said telescoping sections to the adj,,tcent portions of tl-ie pipe, an exhaust pipe connecte(I witl@ the booster motor and extending iipwardly through the tender, @i water tank in the tender, ancl a pivoted pipe 65 section hinged to said exha-List steam pipe provided with a float for keepi.ng its dischai,o,,e end at a constant distance below the level of the water in said tank. In testimony whereof, I have hereunto 70 signed my name. RAY M. BROWN.

UNITED STATES PATENT OFFICE. RAY M. BROWN, OF YONKERS, NEW YORK, ASSIGNOR TO HOWARD @ L. INGERSOLL, OF WHITE PLAINS, NEW YORK. .BOOSTER-F,NGINE FOR STEAM-LOCOMOTIVES. 1,395,476. Specificatioii of Letters P@itent, P,,,tteiited Nov. 1 1921. Application filed April 28,1920. Serial No. 377,145. l'o all t v7tow@ it inay conce2,,n: @ Be it known th@t 1, R@Ay M. BPO%VN, a Citizen of the United Stttes, residinl), at Yo-nkei-s, in the coiinty of '"TeStellester, and St,,Lte of New Yorli:, have iii-Vented certainnew and tiseful Improvements in Booster - Eiigines for Steam-Locomotives, of which the follow .ino, is a specification. My invention relates to aln auxiliai-y or, io booster motor for locomotives for iner@asing tm, etioii in starting the locomotive and in rlinning at low speeds, of the character described and claimed in certain applications for Letters Patent of Howard L. In15 aersoll. One of these -,tpplications, Serial @@o. 299,037, filed May 22, 1919 (patented as P,Ltent No. 1,339,395, May 11, 1920), illustrates and describes, as a preferred embodiinerit of the iiivention therein covered, a 20 steam actuated booster engine, adgpted to drive the trailer truck axle of a steam propelled locomotive, the control of -which is made dependent upon the cuslomary manipulatioris by the engine man of the loco25 inotive reverse and main throttle levers, and also (@o far as the piittiiig into operation of the booster is concerned) upon the manipulation, at tlle will of the eingine man, of a separate coi@trolling device. The control 30 system is, therefore, semi-,,tlitoma@tic. Ili the application of the same inventor, Serial No. 305.649 filed Juiie 20, 1919, a control system folr the booster is disclosed whiel-i is entirely automaitic in the sense tl-iat the 35 booster is put into ,tnd out of operation 'thout ,tny volitional acts on the part of the engine man other than those involved in the customa,.y manipul,,ttions of the reverse and throttle levers @colitroring the 40 main drii7ing means of the locomotive. While the present invention is not to be considered as limited strictly to the, apparatuses sl-iown in these two applicatioiis, its principal 6bject is, nevertheless, to provicle 45 certain improvements relating to the traction@ inerea.sin,&, mechanisms exemplified tlierein, m3@ inveiltion consisting, primarily, iii certain improvemelats upon parts of the app'ar,ttus, as follows: A simplified and 50 novel mech,,tnism for operatinlr the booster "for conductthrottle valve; improved means ing the steam to the booster motor, including) a device which acts to autoniatically throttle infloni, in case the wheels driven by the 55 booster start to slip and the booster to race; and cert,,Lin noi7el arrangements for d'IScharging, collecting and condensing the ex]@iaust steam from the booster. Additional incidental features of iniprovement will be @tdverted to in dese . bing the prefer d form 60 xi re of the invention shown in the accompanying drawinos, ivhereinFigure I i.s a fragmentary view in elevation, of a Iccomotiv-e of -,t common type and its tender provided with the traciion in- 65 creasiiig apparttus ivith -,vhich my invention is concerned. F, igs. 2 and 3 are sectional views on lines 2-2 and 3-3, respectively, of Fig. 1, lookino-, in each case, in the direction indicated 70 by the arrows' Fig. I is a dia-rammatic view illustrating the control systeiia for the booster and its throttle valie, and means for governing the movements thereof, this figure showing the 75 parts of the apparatus in the positions whicli they assume after the reverse lever has been put into the c6rner but before the throttle lever has been manipulated to open the locomotive throttle valve. 80 Figs. 5 and 6 are sectional views take@n on lines 5-5 aiid 6-6, respectively, of Fig. 4, and Fio,,. 7 is ,t fraumentary view, in elevation, with parts i'n section, of the boek plate of 85 the locomotive boiler and the steam supply conduit leading from the boiler to the t)ooster. Lili:e characters of reference designate like parts i.n the several figures of the drawinos 1,90 Ileferriiig to the drawings, 10 designates a locomotive having main driving wheels 11 tnd @a raclial trailer trlick 12 supported on ivheels 13. The booster motor 14 is carried on the trailer truck 12 and is adapted to 95 drive@the axle 15 (Fi-. 4) of trailer trucli: wheels 13. The wheels 13 ai-e normally idle wheels. The function of the booster is to increase the traction of the locomotive in starting and iii j.00 running at low speeds by applying power to these wheels through their axle 15 witli which the booster is geared. After the locomotive re,,tches a gii7en speed,stesm is cut ofT fron-i the booster tnd the booster is there- lo5 upon d'sentrained from axle 15. Any suitable means may be employed for eiltraiiiing, and diseiitraining the booster from the axl.e. Mechanism for this purpose is shown in the lower part of Fig. 4 and consists of the fol- 110

1,395,476 lowin,- parts: 16 is a cranli: shaft adapted to be driven by the booster, this shaft beiiaoproltided wi@h ,t --eftr 17 iii mesh witl-i a gear IS carried by a toygle - Tnechaiiisin 20, 21, the members o' which are given onoular move-L tn m-.nt with respect to each otl-ier by beii@ig connected qt their place of artictilation - witli the piston rod 22 of an air inotor B, the latter consistitig of a piston 23 ,tiid ,t cyliiiio der 24 ag,,tinst the Lipper surf,,tce of which bears a.coiled spriiig 25. By action of tl-ie motor B the gear IS is moved into aiid out of mesh wifh a gear 19. o-,i ,ixle 15. The control of steam to the booster motor 15 is effected through the movements of a tl-irottle valve 26 arran-ed at the upper end of a dry pipe 27 which 1)rojects into the steam dome 9-8 of the locomo@ive boiler 29, the other end of the dr ipe extenclid(y y p Z, 20 thi-o-Li,@h the bacli: I)Iate 30 of the boiler. 31 designates the clry pipe of the main driviiig nieans o'L ttie locomotive, 32 the inain tl-irottle valve aiid 3'a the rod for ol3erating valve 32 which is conp-ecteci -",ith the tlirottle lever 25 34 in 'uhe c,@tb of the locon-iotive. The booster throttle -96 is trrangecl in an elbolv fittino- 35 securecl to the Lipper eiid of the dr@y pipe 27 by me,,tns of bolts 36 -witl-i the interposition of a p,,tekin- rino, 37. 30 Valire 26 h,,ts ,t stem 38 coniiected to t cranlc 39 on the end of rock sjaaft 40 which exteiids throuo;li ,t sti-ifiing box in tl-ie side of the steam dome. The stuffiiig box ,ts shown eoiislsts of a tliin,.ble 41 ,ind ,t gl,@ti-id 42 s5 liaviiio,- ,t bovelect i-@inei- end against wh'ich is presse-cl by spi-iiig 43 the conic,,il face of- i boss 44 formed on 2ock shaft 40. The thimble has t heacl 45 and is secured to the ste,,tm dome by L i-iut 46, p@qckin(y rinus 4@ beiii 40 ii-ilu-erposed bet\veen the \A,all of the steam dome aiid the head aiicl ntit, respectively. The outer end of rocl@: sli,,t'Lt 40 is -,-upporteci in a br-)cket 48 formed oi-i a castino, n 49 sectired to the top of the boiler ,ind is 45 rrovide(-,l ,vith -@t @10 A-vhich is coniiected -@vith a pis'%-,on roci 54t foi@min(-,- part of t fl-Liicl pi-essure iiiotor D, the piston 52 of -vvhich ig ai@r,--ii(Y-ed 'm ',L ClTliiider 5") adapted to rec@lliv@, co@-iipiu-ssed iir, -,s will be herein,,tfter 5o dcscribed. The piston 52 is noim,,illy held to the 017,ter eiicl of the cylilider 5@ by a spi 54. admitted ipto the boostei, dry pipe i,-,ilve 26 is openecl passes to the ,5 5 b,)oste,., motoi- tlli,otie-11 ,t co-tidtilt comprisinioti 6T- p a n p sect' ipe 5 -,.ecl to tho ],,ite ,f the bo'ler, a section of pipe 56 fixed to tli-, 1.)OoQter rqotoi@ -,nd a i)a,ir of telescoping ,(Yie,,- .-).oers a -7@ 58 coiinected, respectively, to 60 I)ipe sections 55, 56 bi@ f.1exible jo@.iits. The raernber 5i exte'iicls i@-ito meinber 58 whieb fo.-,,iiecl A@-itli o,tii@liuo, i)ads 59 for ceiiLorin,-- the cpcl of riember 5'@. The o-Liter enci o'L ti-io coiidliit membe.-- 58 i-s 'tormed iiith 65 aii ciil,,Li-gement 60 in ivhich is arranged, ivithiii ,i sliell 61, a body of ptel@in.@- 62 I-ield bet-@,-eei-i a (ritnd 63 tnd t sleei,e 64, the lattcr uncter pressiire frojii L coil spriii(r 65. A rin(y 66 is iiiterposed betweeii sleel,-e 64 t7l ai-id the pac,Lciii(,,- 61-). A b@tll and socl(et - joiiit 70 is -I)i-ovide(I 1,)etiA,een tli(, pipe sections -)5 aiid 5@ (@onsti@iietecl pi-efei@a]Dll, as follo"Ts: 67 is a bell se,-ured to I)ipe ")5 'and liavin,, sercAie(I i-n'Lo the eiid of the saine ,I fflilid 68 %vhich surrotiiids ,i tlibiilir exteiis"i'oti ii-iemlier 69 75 i'asteiied to pipe 5t', tl-ie incii-iber 69 ,t b.-,Il portioii TO acaiiist AA,Iiieli the ciid of -land 68 bears. A I similar b,,tll aiid socli:et joint, closigiitted 71., is trran-ed betiieeii I)il)e'sectioiis 56 a;nd 58. The coiicluit tlius 50 forme(i has sufficieiit flexibilit@T to perii-iit movc,,liieiits of the boostcr motor', illei(lolit to the movemeiits of th(, track oii NNhicli it is nioi-itited, in respect to the bo(Ty of tlic, locomotii,.-. 85 A chokiii(, dei,ice is prefei,,tbl), pi,oi,-idecl in this coi-i'd@uit for atitomitie,,ill'Ar cliecl-il-l(r inflow, of steim in case the tr@iler trucl'K ivlieels slip Ind the motor starts to rlee. This choliing deviee coiisists of a short pipe 90 sectioii 72 of interli,,tl di,,imeter thi,ii the iiiterlial dianicter of the rest of the coi-tcluit. for ex@iinple it iii,,iy be tayo iiielles ii, dial@ic-,ter -\vliile th@e rest of the coiidiiit lias ,t diameter of' threc,, and one-li@llf ii-iclies. 95 inly iiii-eiitioii eoiiteiiil)lates (lis eliai@(,iii(r the ste,,iiii T-rom th(@, booster iiito tll(@ v,-,,itei@ tiiik oii the toi-ider. 'Plie preferred ari-,iii-emeiit PrONTides ,t. floit coiitroll(,,(l (liscliar,-;e pipe iiisuriiio,- in'uro(Iiietioii of the 100 exhaiist steani below the iv,,tter lei-el iii the tai-il@ l@)-LLt said Aiater IC-ATOI so as to fii,old appi-ecial)le back pi@essure oii the ell(riliel. An @-,rrino-emeiit is :ilso I)roA,- i(le(l, tbl,,,, the exhaiist steaiii, if desii@ed, 10 5 ma' '],)e (lisel@',irgecl into the atii-iosplici-e. '(.1 y desi,,-Yiiates the A),ater oii the t(,,ii(ler, 't4, 75 '@6 ,i pipe exteiidiii(, throii(, I t-Ili the top tiid bottoin of the -",.tter tai-ilc. the iil)per sectloii 75 of Nvlilcli iS PrOATido,(l Avitli i 't7 110 ,idapted to I)c- o])eiie(I aiil (,lose I 1)1, @t, I)IIII c i.-od 'iS, tlic,, lian(Ile 't9 of v;liiel, is 'li, re,,icli o-f@ the fii-cman in tlie, locoi-tioti@-c c@ib. The lov.,-er 76 of tlie, pipe is c(lilleete(I I)v i; riibl)er liose. 80 A-vitli tli(@ exhiiist I)il)e I 8-i of tlie boos'uer. P)Otweeii 1)ipe sectioiis 74, is :i ei-oss fittiii- @2 to Avliieli ,ire piA,- )ted oii o-,)posite sides a p.,iir of diseli,,ir(re I)il)es 83, 83 proi,-idecl i@,itli iiil)l)les 8-1 Avllich ill tllc- CROSS fittill-o'. Pipcs 8,1 ttre coi-i- 1 2 0 jiect(,(l bv t i@od 8,@) sec'ure(l to the 1)ipes b-\ cl@imi)s 8(') ind on tli's iod is siil)l oi@te(i i'loat,. 1 8'. TI)e 1),ii@ts ai,e so 1)i@oportioiied that the dischir,,-e, e@i(Is of I)ipc@s 83 are liel(@ jtist be,'@oAv, the Yvtt(@i- Ic,,i-el iii tiiil@ 'iQ. 125 i,@-.tter iii the taiilc becol-iies too liot 17, ill,e 77 i-iia:@,@ be opeiied to (lisc-li,,ii@(,e tlic,, exiiitist steim to the atip-osl)liere. ffil n-icaiis of the arrziiigei)ieiits d(,,scribed tlle exh,,Illst st(@@illi froin the booster is coii(lensed tncl the heat ]@'.o

1,396,476 utilized for raising the temperature of the feed @vater in the tender t,,tnk, thus minimizing the cost of operating the booster and makinly it possible to eliminate the steam 5. i:r@iect@'i- used in winter weather to li:eep the wat.er in the ta-nk from freezing. The preheating of the feed -w,,tter is an advantage in itself. I will next explain the system of control 10 whereby the booster motor is p-rit into and out of operation througli manipulation of the reverse and throttle levers of the locomotive. This control systern, however, iii its general features, is not ,t part of my ip1 5 vention, being the system described an(I claimed in application Serial No. 299,037 above mentioned. 88 is a ta-nk containing air under pressure. This tank may be IKep't supplied through pipe 89 connecti@g it with 20 the main compressed air reservoir of the ,ti@ brake system. The numerals 90, 91 n,tte ,t pipe which leads from the air tank 88 through a controlling device A to the ail, motor B which hts been described as op2 5 erating the i-nechanism for entraining alid disentr,,tining the booster motor from the axle 15 of the trailer truck. The controllii.,, device A is actuated when the reverse levei92 is put into the extren-ie forward position 30 for starting the locomotive, to put pipe see I tions 90, 91 in communication with e,,tch other. A pipe 93, 94 leids from pipe 91 to t,he air motor D which eontrols the booster throttle valve 26, comniunication betweeii 35 pipe sections 93, 94 being under control of a controlling clevice C ,tet-Liated by the presence of ste,,tm in the m,,tin dry pipe 31 of the locomotive. The controlling device A comprises a cas.. 40 ing 95 formed with a chamber 96 to which pipe 90 le,,tds and a chamber 97 from Nvhich pipe 91 leads, @,,tid chambers communic,,ttinff through ports 98, 99. Formecl i:rltegr,,tll@ with casing 95 is a, cylinder 100 in which 'is 45 ai-r@nged a plunger 101 adapted to bear against the uppeihead of a double headed valve 102 located in port 98, ,tnd the lower head of which is normally seated by pressure of a spring 103. 104 is an exhau,,@t 50 port ip the side of the cylinder. The plunger 101- i.s formed with "It stud 105 projectiiao- tlii-@o-Liah a gland 106 closino- the upper end of the cylinder. When tflreverse lever 92 is moved to its extreme for55 w,,Lrd position on quadrant 107 the block 108 on the lever bears against stud 105 on pliiiiger 101 ,tnct moves valve 102 to seat the Lil)per heacl tliereof and unseat tl-ie IoNver hea(l. --ir is ,tdmitted from pipe 90 into pipes 91 61) and 93. TI-ie pressure in pipe 91 operttes the fluid presstire rnotor B to entrain the I)ooster moto@ ),,vitli axle 15 by c,,tusing ge,,ir 19 to be meshed with the gear 15a on the @ixle. 65 The controlling device C is constructecl as follows- 109 is a casing having a chamber 110 -to which pipe 93 leads and a ch,,Lmber III from which leads pipe 94, these ch@tm-. bers being in communication through ,i port 112 alining iyitl-i a port 113 leading froin 70 chamber Ill to the atmosphere. A dolible, headed valve 114 is arranged in ports 119-, 113, its oiiter head 115 bei-ng seated bv ,t coil spiing 116. Formed integrally -vvi'li casing 109 is a cylinder 117 in ivhicli iS t 75 piston 118 having a hollow stem 119 i-n ivbieli is ari,an(y(,,d a. plunger 120 wl-iieb is adaptel, to be,,Lr ci,gciinst t-he head 121 of th('- doiible i7,,ilve 114. A spriiig 122 bears against piston 118 and ,i st)rino- 123 agtinst plilngel- 80 120. 124 is a p@.De ]7eadinff from the main dry pipe 31 of the locomotive, to cylind(@i117. Valve 114 blocks the, flow of aii- pi-esstii-e fi-om pipe 93 to pipe 94 until stet,m biis been admitted to the dry pipe 31 lead.ing to 85 the ni,,tin cylinders of th e locomotive. -vihereupo-n the valve is moved to allow ,tir'to pass into pipe 94 and throligh this pipe to the fluid pressure motor D which operates th(@ booster throttle valve. 9( In orcier to m,,tke the putting into operit,ion of the booster impossible, except tbrotigli intentional act o-C the engine man, (ivheri such featlire of control is (lesirable) ,t dog 125 is ctrrangecl to normally stand in tlie, 95 path of a stud 126 on the reverse lever 92 to prevent the reverse lever from being moited to the extreme foriv,,ird positiou. on the qtiadrilit. This dog is pivoted tt 127 and is retr,,tcted so as to allo-w the rever,,;(@, 100 lever to be moi,ed to a position to actiiate th(, controlling device -A- by me,,tns of a treadle, 128 . connected to the dog by ,t rod 129. A sP"Ing 130 returns the dog to its noi-mal position ivhen the treadle is released. 10.5 of opeg@((tion..--Wilen the engine i-nan moires his reverse lever to the forward position in starting the locomotive@, if he -vvish@s to employ the booster for a'ssistin(y the main driviii@,y me,,tns in gelting the loco- 110 motive under way, the dog 125 is i-eti,acted by pressure on treaclle 128 ,vhich 9-ilov@,s tl).e 13locli: iO8 oit the reverse lever to come in contact ivith tlie s[Lid 10,5 of pluiiger 101. The pltinger seats tl-ie uppei- head of tho 115 double valve 102, iidseating the lower he,,td ancl tl-ioreby allows air I)ressiire from tank 88 to pass from pipe 90 through 1:)ipe 91 to the f-luid pressure actu,(ited device B citisilig the, latter to mesh gear IS with gelr 19 ancl tl-iiis 12.0 entrain the booster n-iotor -",ith the axle 1,5 of I-,.he trailer truelc of the locomotive. When the cont@rolling de@,-ice A is act-Ltat-(,d, as tbove desgril)ed, ,tir'passes iiito pipe 93 9,iid as.soon as the m,,tin throttle levei, of the locoinotive 12.5 is moved to ,idmi'L ste,-,m to the moin dry pipe 31 the dotible v,,tlve 114 is movecl by st,eain pi@essure exerted ,tgaiiist piston 118 and transmitted to the ITalve through plunger 120 to erniit tlie, pressurc@ to pass 1.30 p

1,395,476 throuah pipe 94 aiad to the fltiid pressure actiiated device D - wbich is thcrebv act-Liated to open the booster throttle valve !@6. Steaiii from the stearn dome is adriiitted to the boost-er dry pipe 27 and passes throiigli coiicluits 55 57@ 58 59 to the booster w-otoi-. The exh,,tust steam from the booster ifiotor passes into pipe 76, '@4 througli the hose connection 80 and is diseli,,ti@(, :)@ed tliroli@_yli pipes io 93 into the ivater tank '(2 of the tender belonv the level of the water. If the -witer in the ttink shotild reach too Iii(,h ,t ten-ipei@,it-pre the fireman, ljy manipul ioll of Plill roOL 78, e,,in open the v,,ilve 't-i in the extension i5 75 of pipe 74 wliieli peri-r@its the exhaiist Iii "lie steain to esc,,ipe to the atmosphere. I 6i-din@iry operation of the locoipotli,e, wlien ,i cei-tain speed li@is been attained, foi- examl)le tell 01- t-@Nlell7e miles per hoiii-, the reverse 20 lever is moved back a few notelies to shorten the valve movemerit. When this is doiie the (louble vaIA7e 114 of the controlling device A. being releasecl from pressiire of pliingei, 101. is n-ioved by its spi,ino- 103 to close coin25 munic,,ttion bet-@veen pi e 90 on the oiie side p and pipes 91, 9,3 on the other, openin(y a Ni,.Ly of exhaust for the latter ai-,d tl-ie presstire actuated devices associited therewitl-i tbrough the exh,,iust. port 104. The springs Bo in the fluid pressi-ire i-notors D ai-id B eltect, respectively, the closiiig of the booster throttle valve 26 and tlie, diseiiga(rement of zn o,e, ,0,,, I fron', gear 19. Iii this w,,ty the oste@ I Is 31_lt out of op6rition Avhen the locol,D -d35 _Otive re@Iches a spee(I wliicli in accoi aiiee vvith the ordintry practice eiiiployed in the control of locomotive,-,, Nvill be approximatel the sai-ne in ,ill cases. The y operation is automatic in the sense that it 40 i-equires no volitional acts by the enuine man other than those which he -woiilcl @atiir,,tlly perform in the control of tl-ie m,,iin drivinmeans of the locomotive. If the Avheels 13 i,%,hich -,ii-e driven by tlio booster motor, 45 should slip, the tendency of thc- motor to race is cliecked to a large extent by the clioking of the stetim whicli takes place due to the relai-ively smgll diaitieter of the pi-I)e section '@2@ forming part of the booster siipl)lv condiiit, 5o ivhich thus acts as an ai-ito,-nati-c governor.