3sibeing ii-r ab.ged betwnn such 1),ink qld ti-le bank 22:'aiid tl).e feed-water 9 leadip- 'into the ,icl(litisuppiy pipe 1, onal drum instead of inf'@-, the drtiw, i5. The dryin.g or superheat@r@g t@.lbes 24 from -the steam-space 6f the drurp 34 to the ste,@l,-n8pace of the digeharle druiti. I'n a fi6iler embo@@ing the C'Onstruction just described the feecl.-water @,-nters the io drilrd 34; then slowly pas@,es thr(>ugh and is @relieated in. the tube b,@inli: 3'1, thu@ i)re.m elpita.ting @. any of the ;mp,,iritip-s coptai@iiect in the water; tbed- enter@ t ' he rqtid (lriiin 13 and p,,tsses into tL@e maip. eirculat;@OD. . The i5 conriection.36 tend' to m-aintaiii ,i p,-,i@ity of s Nvater-levels in the drunis 34 aii@l 1,5, anfl therefore stich connection is preferil.)Iy used; but if desired it niay be oniitteci.. The, wet steam from the drurn 15'p,,tsse,,, throiigh ,2o tubes 3h and en'ters the driini 34 ,it fr. aiiile to the axis of the latter, the ertrain(-cl water, by reason of its moniciituiii, beitia projpcted dov@,n upon and e(,mmi-@iglilig iv@il'. tile -elatively qtiieseed.i- water i-ti s@ tid driiiii 35. 25 Such steam tlier- passe,- into l@liroticli tile tubes 24 whereiii it is diiect ai).(--@ stil)ei,iieated bef,6re eritering L)nd floining -@@roi-q the Oischarge drtim 16. - it is to be understood,that the parilicul,,tr 13 0 design of the bo-i-ler belov,, th,-. -ivater-level do@bs not affeet'the ptici-ole of iny iiii,critioii as apliliecl thereto; an&th@refore I do not limit mysi@lf to th6 specific type or d@sig@n of boiler her4@in @elected to exerqplify rny i.n35 ""Cntion. It is also t'o be iinderst,)od that I do not restric- myself to the details of co@lst.rtictioll herein disel.osed, such, for exaniple, as the number- and fo@-Tn ofthe tutes iD. riain and suppli-nental P,9.tl-ls of- circulation, es -i 0 as sneh featur may be varied in many respects w@tliin the spirit o-@' the Invention aiid the scope of the app?nded claiins. I claim1. A- steam-boiler liaviiig a C011tiD.UfUS 415 main water circulatiop, path atid ,i supple' me-ntal water eireiilatio,-i path, said ir@,tin p,ith iiieliidin& a steam-a-@id-water recel)t,,icle wherein the ste,),m is diseiigqg,-,d fi-oii flie ,v,,tter, tp-d sal 'd - supplewental piti-i mmpris50 in- a steam-,tiid-,,Y,,tter froin IvIiieh the steam i.@ dischai-f-),6(l froni tle le I)oilei-. said Iitter recel)ta(. @einu oi@,ts-Lde the m@in pa.th of eirei-ilition, D-ie,,tns wliereby a relatively sinal.1 portion o-,' w,,iter i-, 55 (I iverted from the mtin p,,tth o'l eireiil@itioii ,in , (I (@at-tsed to @ow ilito the disch-,trge t,,tcle, @nd me@(ns located )vitliin the lie.,itin,), zone of the fti.,-x-iace -,Aherebv ,i correipoiidiiig flo@,v, of water frorn the recep60 ti(-,Ie ba(!k to the m,,tin pdtl-i of (-ireiilqtion is effected, iiid meqiis for con(I-ticting tl)e ste,,imfrom the steam (lisen,rigin(i receptacle to the ste@m diseliarge re(-eptael.e. 2. A @,team I)oilie@ liqving L con@;ntiotis@ 65 niain water eirettlation patli and a siipT)fe,- mental water (-irc;ilzition 1)iztll col-nilitillic"ltin,-@ %i,itli the front anct reai- I)oi@tions I-es . J)e(.- vely of the sii(i.iiiiiiii 1)atli iii'ti c liiding a@ its I )oi-tion a stetini.- @ind-ii@ate,, receptacle t he @te;illl is 7 0 d i-,eiiga,red froiyi tti,3 iv(iter, ,tn(i sai(I ii ienti.1 p,,ttli coini)ris@@i(@, it its foi--%@-,ird por't ioil tf rorri whiel-i the s'tcaiii is (lis(,Iiai,(,-Q(l fi-oiii @lie Ln &.@ I)oiler, said 'iwinr out@,;(Ie 75 the ii-iain I)at.1-i of cil'Ctllttloii, rto@iiis i i-elati-k,ely sri-tall I)ortioit f)@ the niain 3,)o(ly of eirelilating -%-viter is clivci@ted in@l'o the (liscliargi@ i-6cel)tacle, ti-ict rneails lo(-a'L-ed witl)in the heatiiig zone of t'il(@ fiii,L,,ice NN,Iiereb3T a so floiv of w,,tter fron-i the 1'raiit to the rear s'Le,,im-an(I-v,,,iter is e@'iecte(l. ,ind meitris for conditetir,,, tlle steii-ii fron'i the, rear to the foi--"@ai-(l receptael(@- 3. A steam I)av-1n,- t coiitip.,,ious 8.r TYlaiD -water eireiiiation pzitli aiid @t stii@plemejital. iyiter eirf"Lilatioii pith -1111- iirith 'the i'ro,lt an(-l i-ea,- poi-tiors resl)ecI.-@ 'i ely o-L' the ni,,in @,)atit, s;@ii,l .rii@kin 1),ktli iiicli@l("iing a,t its retit@@'arel portio@D a, @va'tcr rece,@)ta@--le @vliei-ei-ii td-tr@ steiir. -,s (lisfi-om the Trental ppth coml)ri@,,iiig at its foi-iva,,,-d portion a -iorom w h;.cli the steim is (lischai,(Yed from the 9 5 b oiler, sa@.cl latter t,(,ceptaf.-I.e o-,It@;@ide t. th e 111,1,iD. ,),tt'h of (,ireti a ioii, "Ilea.-Is . wlieie'b y ,L relativelv sinall of the Tn,,tin b ody of eireiil,@itin(- w,.-@,.er 'Is clivei-tcd i.-,ito th e disc-liarge r@,ceritael(@, and i-iiea-.Is locqted lo o the lieating zop-e of. the fuIM6-,e ii,l iereby a flo,.N, of water froi-n- t@)o -@@fcait to th e rear steaiii-aiicl,--@v-a'@ei@ rec--3)t,-cle is ej'- fe cte(i, ,iild nieans for (,onCt-Licti@,u, the, ilr oin the rear to the forNvtr(I recep'ctiele. .kiid lo b P - water-a,,tg6 @iii-ectly connected tr) the iroiii r ceeptacle. 4. & -viater-i'til)e '-)oiler ha,,,,.ng fro-iil,; aticl r eaf t,-@,iiisverse icorwar(i witet, driiin, ,t riiiij cipi-ii-fl, @.lo -, baik -of 'tiil)es connecting sa-.,rl mij(l (iriimto t'lie iv.,ter driiin, a secoi-id b,,tnl@ of tl,,il,)es connepti-@ig s,,i,,l -;vate,-,, cl-2iim -Lo The rear steam-ancl-i@,,qte,- a tb,,i,d bank of titbes con',-iec@-iilg said re@qr di-iirc, to tlio m-@icl ii5 di,iini, -@. i-el,-,tively sm,,til v@,,,-,ter corineetion I)etween tlle water kii--tini i@ib 0. the ivaterspace of the front steaqt-.in(i ' -w-@ter relativeiv sm-Ji, tube, coinecti("r@ bet"@eer, sa@i(]- iv,-Iiter-sp.,ct, tiid tlie. @()f t'lie, 120 rear ,,teani-an(I-NN,.i'ter driirt-,. sti(I - latt,@,i- ti:ti)e conpection 1)(@iiig -witliiii the li(,,,ttiiig zon e of the ait(,-! for (!oii(litc-tiri(,, the fron i ',Iic, to the fj,,ont steq m-aiidivater 125 5. A Nyater-tul)e ]:)oiler liai,in- fi,oiit iii(I i,ear trinsverse @t foi,i vird iv,-,'uer (Irtirja, a mll(, t a I)ank of t,,il)e,3 s@ii (I iiiii(I (Iriiii-x to the water clrt,@iii @t s(,Coilci b,,iiik of tktl)e@-, i3c

connecting s,,tid water drani to the rear steam-ancL-w,afer drum, a third bajik of tubes cor.i@ecting said i-ear driim to the mud di-tim, a relativeiy small water tiibe connectioii between the water'.drlim aird the w,,t,ter-spam of the front steamarid-water drum-, a relativel3, smtll -tiibe connection between said water-spa(@e and the water-EI)a,ce of the re@r steamand-water drtim, said latter ti3,be c,,)nio nect.ion being located within the heiti@tig zone 6f the furnace, ,tiid -rn@anr, for conduotiiig the ste,@tm from the rear to the fr,6@nt steani-ond-water dr-am, to-ether, with@ a directly conriected to the fro'nt steam--ai@d-water drum. Si-iied @it Tiev@, York in the couiit@, of n@ndState of New York this third day of Mttreli A. D. 191@9. EDGAR KIDIT@EIAL.

"U"NITED STATES PATENT OFFICE. I-r,DGAI'@ !C.CDWIFLL, 01,:'PHILADELPH---A, PENI%TSYLVANIA. IL R. I'atei tt:ed Aiig. 3,192 0. 1,348,179, Speciii(,,ation of Letters.Patent. Applichtloii filed March 4,19'@-9.. Serial No. 280,581. To it may Be knoi,,-r@ 'hat 1, EIIC@Alt '@IDIVELI,, -@ citl"z(@i the -ulnited S-ates, iesideiit of I ol the' city and couiity -)f Piiil,,i.de'lphia tnet Stat o' -Peplisyl-,- ,@inia, hiv@@ in@,,tnt,@ed ceie tftin ii qiid tiseful in 'v Steam-Boilers, of -vvhich the fol-IOW'l@Ig is a -s pecific,ation. This relates to steapi boilers; .0. having rp-fi.,rexice, mor,- I)artculirly, to that type of @oiler@ ,Yhereiii traxisverse re(,eptL,cle,,@ aiicl bt,,nks of -,vater-tul-,e-,, togetlier ",itii stiitable baffling, are ployed, aiid wl-Lerein at least tivo of sai-Cl r(@i5 ce, 1 ,t,,Ycles are ari-tiiige(i parl,l-k, above and _)a @i belo-%v the iiormal level of tile boiler wa'Ler iii order to coiisi'uiite steaiii-tincl-ivater recept,,icies, whei-e(,,f.- tl-.e iespectin,e ste,@iiisi)aces are connec'Lecl directl- .y or ii-id'i,eetly 29 L@ suital)ly-disl.)osed di-ying or superhe,,7,iing tiit)es adapteci to conduct the stetiu, which is III)erate(,l j'rora It'lie Y,7ater i-ii one receptacle, to tlte steaiii-spicp. of the otlier receptt,,cle prepei--,itory to the diseliar(,e of 25 the -,team for service. T4@- object of my inn-entior. is to I)i@ovide a siiil)le aid efqc@ieiit coiistruct;loii the true level of the boiler -,-,@ater Nvitlilii tle stearn Ctisch,,rge @c("ept@icle is Cori-ect-ly so cated, irrespectin@e of the fiti6t,,iatio-is of the i-@@ater-level in the stean). disen--,i(rin(r i-e(-ep@, t"- t-,icle or other reinote porl,ioii of ttie boilei, or @Lhe r,-,te at ivhlcli. the 1,)oilei@ is beiii- (1)) crated; @-Iiiis obviatiii,@' tlle otilersb wise lill)ility of the risliig and iiii.xiii,r (f the iv,,ttei- w,@tli the stetirl. as tle 1,,ttter rii,,,Iles idto aiit is ivitiidra-%i-ii fvt)iii tti@-, (!is(-Iiarge re(,eptacle, a.Tid also the 1)i-ol)ir an(I tile I)o;lel. to be A@o eisill,- niztiiitair@ed I)y !lie ol)c@t-ator. A@, coi-diig to niy iii-,,eiitioii I I)i-oN-I(le, in additioi-i to the niiin iv@iter f)',Itll of -tlie boi-'Ier ii-i whi(,Ii tlte ing j@ecep'z,acle 's inelti(le(l, a s '(1 re 45 vv,,iter 1)atli in AYI)i(-Ii ti II cei,)ta(-Ie tnd the steatn (liseliai-(-e i-ecei)t@i(-Ie are iiieliide(l, said stipl)iei-ieiital patli so dis-,)Qse(i aiicl propoi-tione(I iii relnti(Il t( t,lie w-t,,iD. p,,iti3 th@it-I the noi@iy@,,il witer-level .50 witiilyx the dis(!Ii,,tt,ge reml)t4@el-, is @iiaiii,- tained. I contie(,t the (Ylass directlv to the 7.v-,iiter-spa,ce of- the soid (liscliai-ge, recepticl6, and ther@--I)y se(,Lire an, ac.citrate irildication of the norm,,@l level of the tb -woter iii the it all times. i,i@ie I)refL@i-re(I consti-tiction liereiii illust@-at'6d embodying the prillcll)le olt mv ini-eiition ivill be liereinafter(lescrii)e(.1 - @tiid tlle scol)e ')f 'Llic ini-eiitli)ii tlieii be define(I in 'Lhe appended claims. 60 l@-i the dra-NvingsFi,yi-ire 1 i@@ a i)art".al ion-itii.,Iiiial vertical section of -@ boiler of tlte transi@e,.,se (Ii-tirf, t3,I)e einbo(lyiii,r niv inv tio . eii n ce@tlioii of tli(, il) )a- 65 Fig. @ is -,t irertical s i'@it,,ts ,is oii the -lid@e ol' Fl (r, 1. Fik,@. 3 is a slinil,,ti- -section, a's oii.t@lle line of- F'g. 1. 3-3 1 Fig. 4 is a section t@) l@i-. 1, slioivzn in,, tlle boilei@ eqttil)l)e(I Avitli aii id(litioillil 70 -L' -id 11' s'ea-iii - ai ater dr-,tin and coniiectioiis tlierefor. to the di-aiviiigs, 10 desi,rnites lic, f the I)oilcr s(--ttili,- 11 t , iii-iia(-e tliet@eii-i, iii(I 12 the oiitlet o@i, I)i-eecliin,,- to the si-noke-'75 sttel@ it the rear o-f tlic, settin(, 1',' (lesi(,Iiites'a ii-itid (Irtini @it the reir of the I)i-idge will of the ftiriiace-, 14 t i\,ater (irtiiyi locate(,l al)on,e tiie foriA-,-trd 1)ortiozi of the fitrii@,tee, aii(I beloiv the noi,mil %v,,iter- 80 ari(I 16 tivo steaiyi-@iiid-water (ii-tiriis 14i-esl)e(-tiN-elv. I @ll @ p "lie ilriiiiis 15 16 are loeated artly tl)oy'e beloiv tl,.e iioi.,mal ivatei-- le,,,el, 'Lliiis i.1 eicii ,I lovter watei--spa(-e 85 IT ii-i(I ari til)l)er ,tetini-sl),ic 18. TI-ie feed e i@@,it - i- Pil)e 19 Ic@a(Is iiito the rear dr'Lim 15. 'J'Iie (t@-iiiiis 1,1, 14 ii)(I 1,@') li-e conn-e(@ted in S tt(,e eC' (I iTI (r oi-(Ier J)v 1.)@iiiks of tiil)es 20, 21. 22 i@esl)e(.Elx-elN,, tliii' 9 I)i,oN,i(ling a conti-Tiiiotis go cii-(,iil,,Ition 1)'ath for. the i@,@atei,; t n(I 1),iffles 23 ire, sll(.Il lia ordei- @llo (lirect the liot grl,@es .11)(I !)I@o(lil('ts of coiyil)tisfioii tliroti@ril :11)- 1)1.ol)l.iite froni the fi,ont to tli(@ i,(@ar 95 of the iviiei-c@l)i, I (.olltiiiilolli (.il@- (.111:ttloll of the A@7@itei, ti@l.oll(-Il 'tlie clriirns tt-,i(i tul)(@s i,,r effected. Illfi(, steaiii-sl),i(,e of the @eitr 111)1)ei@ (ii-iii-n -olille(.te(I w' -lie @ itli i sl)@t(,(@ of iob @') is ( t'jie fO"w,"'(l l(@) I)y nie@iiis of a sc@i'ies of 24 I)refer,,ibly rtngeci -witilill tfle 1)@ttli of the liot (rises fi-oll, LI@e )N,Iiei,(,I)v f) Zle stelpl Is raj)idlv as it is liberiteci -fi:'Oln t))(@ )i-ater in 105 tl@-e di-tiril 15 flows into tlle of tile iil)per drlij-n lCi.' sii(-i'i steill@ (1',Iling it.@ tlii@oti(,h tl,,@ ttilies, efT-(Ictllll'@y (Irl(@(I oi- siil)et-li(,ated. The - (Irtinti 15 is provicled lyith 4discharge portion 25 110

through whieb the di-y or superheated steam as rapidly As it is pr'oduced is taken off for service. The stearia as it 'is disengaged from the witer in the druiia 16'eau,@,eb a constant @Lnd substantial fluctuation of the normal waterlevel wiflliil. said drlim thus, ren i@,r;ng i.t difficul-t by the usual'water-C4ge to deterr@iiie with aily de--r@; of' nectirac y io the level of the boiler water. Mareover, in some cases entrained water in the steam -is liablo to pass over t6 the forward drum thiough the tubqs 24, and iinless such water be withdra-,Nn it floods the drum 16, and d is carried oi the function g TUI)OS. r-ievei wi,tliin the- drum 16 cori@espon ing to the normal 20 water-level within the steam-disengagj.ng drLuii:15, ifrespee'tiv?,, o the disturbance of the water wi.thin thelatter ind of the de-. livei-y to the drum 16 of wa@er cari-ied ovi,,r by the steain I reduce the capticity of the' 25 t;@e bank 21' coiinecting the watev"drum witli the -steamdise.Qgaging d I iinn@ -,"and diwise w6uld pass -through sai(I tiibes into a second@ry path 6f @irci@d4tio'n in -which the so drum@ 15, 1,6 ire included; that is to @ay, I' connect the driiiyig.,14 and 16 by meaiis of tubes 26, aildthe drums 16 and 15 by iiieans of a corresponding numberOf tubes 2j', the capdcity of wliieh t-abes 26 27 is .t@proxi3ii ma,tely equal to that of th'e tubes omitted from the bank 21. Thus a relatively small @ereentage pf the water is diverted from the nidill eire.iilationlinto the7 dnim'16, and. fhence circulated to the drum' 15 a)ad back 40 again to the -.nain circulation, that is to sav.' the kiiietic energy of the ris ' ing water in' the drur4 14 compels a flow through the tube @conii,ection 26 ul) to the forward steam.and-.'Nva,ter drum;. and'the.w'ator-tube con46 nection 27 enables the water to flow backward from the, latter drum and thus qomplete the circulation. The tubes 27 aie. a,rra.nged W'ithin the ' path of the'hot gases flow]-ag fi7om the furiiace. and are tipwardly 60 incliiied as shoivn froni' the front to the re,,it- of the - i,ppar@tus, in order to iii'sure the circulation of the water from tfie water-space of the ,front to tht.t 'of the r6ar steam-andwater driim. 65 It is to be noted that the volume of w,,tter diverted to' and flonvijig,throiigh the secondary phth is small compared with that flonving through tlle niain patli, the proportion being sucli that a steady level of tht .60 water witliin ihe drum 16, corresp@nding with the normfi,l ' level 6f the water in the drum 1.5, is maintaiii@d irrespective o'f the disturbance of , the water in the latter 'fts al)ove rn""tioiied. I have foiind . that - witli So -the kelaiive area of the main passag@, as through the tubes 20, and t,he 'supp'lemerltai-Y pa,ssg,ge, . as thiough the tiibos.'26, in tlje vatio of tib6at 20 to 1, o@r 5 per ceut. excelleiit resiilts are attain-e-d alttioughl-,6f, course T io iiot liniit my@ell' to t 'hat par- @,7,n ticular' ratio oi, 1)ereenta,ge. I att,%@-h the pipe coniiections 28 of tli w ter-gt g6 glass '29 direct.lv t,o the di@um'16, atd'lience the true-level"of the ivater within the boiler is accui@atelv i-,,idi(@ated. irrespectii,@of the.agi7'5tation of- the water ;_n the -steam-disengaging. @drum or other remote portion of the boiler. In a boiler of narrow.width I preferably arrange i@he auxiliary eiretil.@tion tiibes 26, $c 27 adjacent each side of tl-ie. w,,tll of the setting, as seen in Figs. 2 a,-nd .3, bilt iyi a wide@'- boiler,eiiplbyi,,ng a lai-ge@ -.oumber of main eirculatiort water tubes, and thereforc@'an. inof cretsed numbell atixiliary cii-ettlation, 8o tubes, 1. prefei., to a.rra@iige the sets of a xu i4'ary, tubes at suitable. iiitervals apai-t taroii@hout'the width of the boiler, I ordei t6 prevent, the stetim from imn @inging-against and. disturbing the snrf@e: e 9 0 of, the water contained within the drum. 16, clk yingorsiiperheatingtubes,Ipiovid@siid di-um with'a horizontal deftpctin,g plate 30' directly below the exit ends of sucti tubes 95 a'nd 'a'bove the water-level,.whiell plite diverts th e steam. fi-om its downward path preparatory to escai)ing,, through the-dis chai-g . c poi-iio@ 21. This plate is hinge4 to the inner side of the.drum 16,'as itt 31, a.nd 104 is supported in horiz-ontal'positioii b h ks00 32 whicli.are positioned within th@ c rum to engage eyes 33 on'the pl,@tte.@ The plaie is hinged and t@uipoi-arily 'support I bd ag - just described in order tl-iat it can be ieadily uri- io 6 hooked and S'wting downward to facilitate access to the e-nds of the tubes..21, 22 when it is neces,,3ary to expand them into the tube holes in the wall of the disch6,rge drum. In.casp, the feed-water supplied by the ijo .19 contains a large saline'coptent , viopipe lent and const,,ipt foqmijig of the water within 'uhe druin 1.5 will occur apd large bu.bbles be thro-v@,n off froir, the disengaging gurface, and carried over with the. steam, iir thereby rediicing the pra6tical effici,6ney e,f the. boiler. To oyerconie this objwtion in a boiler embodying the principle"of MT ilnvention, I provide. the construction illustrated. in Fio,. 4'of the drawinos; that is . to lpo, sa,@, I eqiii@'the boiler with a-n ad(litiolial' st e'am-ai-id-wqter dru.'m . 34 which is posi1,@-)ned at tlie' rear @. of. the api)ara,tus and @kbove and below' the water-level; the st(@am-and,viater.'spaces'of-'sucli drum being con- 12,5 nected with the C()rie,qpoiiding spaces of the driim 15. b@ rseans of steam ind wa,ter tubes 35 36 re@pectively; the water-space of said dr'um 34 being conriected with the mud drurn 13 by - a biink of tubes 37; - suithble baffling. Veit the proportion of wdter 'whi6h other.-. .'as,the steam rtishes ijito the latter from the