US1109041A - Steam-generator. - Google Patents

Description

A. A. CARY.

STEAM GENERATOR.

APPLICATION FILED 00T. 26, 1911.

Patented Sept. 1, 1914.

5 SHEETS-SHEET 1.

A. A. CARY.

STEAM GENERATOR.

APPLmATIoN FILED 001.211.1911.

Patented Sept. 1, 1914.

5 SHEETS-SHEET 2.

l5 WS@ III! Illll N S vwo hte@ @13 a Sito/'Lump 6% A. A. CARY.

STEAM GENERATOR.

APPLICATION FILED 00T. 26, 1911.

A. A. CARY.

STEAM GENERATOR.

APPLIUATION FILED 001.26, 1911.

Patented Sept. l, 1914.

5 SHEETS*-SHBBT 4.

SWU@ wie@ @ZL/.t a. CMV @13 @111011412130 WMe/awa;

5 SHEETS-SHEET 5.

Patented Sept. 1, 1914.

Il... 33H3 ttozuu 7% www A. A. CARY,

STEAM GENERATOR.

APPLICATION FILED 001226, 1911.

UNITED SrAjii-E.s3 PATENT einem.

ALBERT A. CARY, OF NEXV YORK, N. Y.

STEAM-GENERATOR.

LUHLQH Specification of Letters Patem.

Application tiled October 26. 1911. Serial No. 656.798.

To G whom umg concer/r.'

Re it known that I, Ammer A.' Gang-a citizen ofthe lnited States, and a resident of. New York, county of New York, and Stale o-fI ew York, hare' invented Certain new Iand 'useful Improvements inA Steam- (lenerat-ora, of which the following,r is a specification. A

Thif.l invention relatcs't-o certain new. and nsefnl iinprorementr; in inethods and apparat-ns for generatinar steam, and more part-icnlarly to that of thewater tnhe type.

(lne object-o my invention is to l)roridc an arrangement of the class described,l which ix extremely nimple and e'llicient and yet nmeh reduced in size. as compared with prior `@team generators; 0f theg'same capacitv l. further object of my invention is to provide a method and :steam generator in which the steam generated shall always pass in the :fame direct-ion as the-water -in the steam generating tubes.. and in which all 'of the steam generating!talles"are arranged snbstglintially parallel is t-ln'it the lspacclec.- enpied by thelio'ller'is.mnchreduced, und

the boiler as a wholerendered .inoreellieiente A lfiirther objcetrof Inyinvntion is vto provide a vboiler with one or more o the nl'ove advantages', and in'whih the water tubes are arraiigedlin sncsive banks, and in which water is Sup lied to' the'lower end of ea'ch bank of tubes lint passessnrcesqirely 'doivnwfardljx from ybank tofbank. i

A fnrtheaobjeet of my invention is to proi'ide. :auch an arrangelnel'lt with one or more of the aboveadvantages, in which the,

.steam generated in the various banks of (alici: iscolleeterl at the head of each bank or section and taken directly 'to the steam drinn willmnt being caused to pass through other hankn of water tube. ,or through inter-v reninybodies of' water.-

A further object ofjny Vinveiition is to provide. inlprovcd means for controlling the. water :aipply to sach generators, andan improved mean#Y for frcei'ner the steam from water before the steam is'passed to the Steam drum.

will more clearly appear fi'onrtlie detailed description given below., taken in conlicction with the aemnnpanying drawings which. -form a. part, -oll tlns specification.

Referring; to the drawings, Figure 1 isa vertical :section of'a steam generator elnlml 'mfr in im rorements 1n one form -an elevation,

vand the. lefthand .-3, water drinn;l of a steam etantially parallel al'xdhincl i ["mther objects, featuresand adrantages taken on theA line l-lofflig; 2,' certain parts heim.r shown sojmfewl'nit diagrammati call)v for the `Sake ofclcarnesfs. "Fig il 'is tlre. ri; fllit.` hand portion being a section takenfon the line'llll portion being a front, View of Fig. 1. Fig. i.. i elevation showimY thestcain pipes connect-- ing,r the 'various ieadcrs. Fig. 4 is a detail section taken on the line IVflV olV I"i:f.'3.

Fig. 5 is a Vertical. Section olha, modified Ytorm of `genera-tor taken on the line "if-Voi Fig. l. Fig. G is a vertical the. line Vf-#YI of Fig.. 5; lge, and 3 are vertical sections of Still further niodiiie'd form of generator. Fig. 9 AiS'a detail(see.,q tion taken on the line Xfl'X of lfig. '3.

section taken lon sents the grati-,a steam d rnnhaiidfj 1: n 'n.or.` generator is provided witlra veri.. of water tubes A. Il, (ffl). Y bank in this` conslri-irtioni tnhcrA of therarionsbaiil rr'x'nged'snhv ed'fnpn' rdly toward the fronti-*ofthe generator;jand Vthe banks are arranged.cleely fadjaegnl; t' another, nml succes i 'lhe npper front'em'.; o the .'tu'he's `ol"'}.:1eh bank enter headers Se f hf" l 1.".2', andn'll, respectively. while ,the lowf.; emi-.5t of the tnhes` ofcaeh bank enter headers 151i', .17, XS. and lil, respectively, thas formingv a pl\.1!:\.lit. of sections.' Y I' Arranged adjacent to therein' header-S114 header-'v10 withthe..chamber .l. .\v pipe-'Ill a detailed iront..

r Ily licln'n" one another.

connects the chamber V13 "with the rear header 17. A pipe-43?) eminerts the' fronthender l1 with the chamber l. A pipe ill? connects the. chalnheilal with the rear header 18. A pipe 37 connects 'the front header 12 with the chaniher'l. A pipe 3S l conneets the chamber 25 iththe lrear header VSO 19. A pipe 39 connects the front header 13 with the chamber 26. A pipe 40 connects the chamber 2G with the rear header 19. A pipe 41 connects the chamber 20 with the steam drum 2. x A pipe 42 connects the steam drum with the water drums 3, 4, and o, and also with the chamber 20, in order to equalize the pressure throughout the system.A

The chambers 20 to 26 inclusive, are connected to one another by escape pipes 43' so that any air or va or which may collect in any of these cham ers may rea/dilypass upward through the various chambers and ,the pipes 43 and 42 to the steam drum 2,

thuil` Supplyingiwater free from air or vapor to headers 14, 15, &c. The various pipes 28 to 38 inclusiye, are arranged at one side of thev banks of steam generating tubes A to F, and are preferably built in the brick-work of the enerator, vso that they are substantially outside of the main heat zone.

The various front headers S to 13 are connected together by means of steam pipes 43 bent U-shaped so that the steam which collects in the front headers` may pass rapidly upward from header to header until it reaches the top front header 8 whence it is flows downwardly through pipe`30 into the rear header 15 of the next succeeding bank below, flooding the tubes of the section or bank B. 'lhe water in these tubesflows upwardly into the front header J whence it passes through pipes 31 to the chamber 22, thence downwardly to the rear header 1li,

looding the bank (l, then into the upper header lO'tlu-ough pipes 33 into the chamber 23, thence downwardly througlrpipe 34 into the chamber 17,- flooding the bank l), then from the front header 11 through tubes 35 into chamber 24, thence downwardly into the rear header ,1S flooding the bank l), and from header 12 through pipes 37 into chamber 25,-thence downwardly through pipes 38 into the lower rear header 19, flooding .course the lower bank of tubes F. Any overflow from these tubes into'the front header 13 may pass through pipes 39 into chamber 26 which is connected with the rear header 19 .by pi e 40. It will thus be seen that the Olhe water through the boiler is upwaridl in all of the tubes 6 und 7 of each utis downwardly, from bank to bank s 80 tliat all of the steam generated in the 'banks of tubes u\ to F passes upwardly therein in the same direction in which the water passes through them, thereby facili tating the movement of the steam to the front headers S to 13. In the front headers S to 13 the water is separated from the steam, the water passing through the pipes il) etc.. the steam passing upwardly through the pipes 43 and 41 to the steam drum 2. 'l`hus a progressive heating of the water is provided in the generator itself, the rear headers being purely water headerspwhile the, front headers are steam headers and in which practicallyv `all of the steam is collected. A pipe 45 connects the three water drums 3 and 1 and 5 together so as to equalize the pressure and water level therein. Some water will be condensed in the steam drfum 2 and when its level rises above the top of the pipe 4l, water will flow down through pipe 41 to chamber 20, to act as feed water for the generator. 'lo take oil an) air which might collect in pipe 27 a pet cock 27 is provided.

Referring more particularly to Figs. 3 and 4, the various front headers suchas 9 and l() are providedwith hand hole openings -l6 covered by plates 47 held in position by means of spiders npand bolts 49. The hand hole openings are arranged elliptical in shape so as to permit the ready entrance of .the plates 47, and are also arranged of proper size to permit the withdrawal of the tubes 7 ol the various banks. Opposite the tubes l', of each bank are arranged openings through which the tubes 6 of:.each bank may be withdrawn. In these openings at are placed spring rings 51 against which are .si-ated the beveled ends of the connecting U pipes 43S. The, Ubendsl 43 cinnect the front headers with one another as is clearly shown in Figs. 1 to 4. 'l`he-U-bends are thoroughly forced into and held in place by means' of clamps 52 provided with hooks oil engaging under pins :'il. 'l'he pins 54 extend between uprights 55, integral ,with or sel cured to the Vfront sides of the 'front head-- ers. 'lhe U-bent pipes 43 are provided with bosses 5f which are adapted to be engaged by screws 5V passing through they clamps 52, so that by operating the screws 5H the U `bent pipes may be thoroughly forced into plare to l'orm -a steam light joint and properly connect the front headers so as to fornr a direct passage of the, steam from one headr-r to another upwardly to `the steam drum.

ln order to properly free the steam from water as it leaves the upper ends of the tubes and 7, and prevent the steam from carrying water with it u i through the connecting pipes 43, l proride bellies' 57. The

baflles 57 are arranged opposite the ends of the U-lmnt pipes These baffles are hollow and tubular in shape and provided with flanges at 5S, which are seated in the seats of the openings 5l). The ends ol the. bailles 57 opposite the pipes /l are closed as by partitions .39, and the tops ol' the baille ineinbers are cut away as at 6U. 'l`lie liatlle ineinhers are proi ided with openings 6l in their bottom poi-tions, as clearly shown in Figi. 4. It will be understood that the outer ends ot' the tubular inenibers bi' opposite ithe partition 5" are open and lead directly into the iipes 43.

liioni the above it will he clear that as the steain and water rush out olI the upper pipes 6 iiito the 'rontheaders, the steam ,uid walter will strike the partition Till. the rater beingr caused to drop downwardly whhe theA steam passes over the top of the partition 59 thrfiuph the cutaway part 6() and into the baille nienilier itsell'. The steam then has free passage upwardly through the pipes l?, to the steaiii druin` Any water which inay collect in the baille member 57 is drained out through the openings 6l.

ln order to provide suitable and auto 1 matie means for regulating the supply ol' water to the generator, l provide a pipe 6:2 extending into the rhaniber 26, thence upwardly through the pipes 42S and into a condenser at 63. 'llie condensa-r (Li is provided with a plurality of passes as 6l, 6.4 through uhich etealn troni the pipe 62 is ilaused to pass. Froin the lower pass 64 of the condenser ('l a pipe 65 leads into the water druin .7, and thence into a chamber 66 situated in the water drinn 'lhe chamber 66 in the present instance is t'orinedl of a 'relatively large pipe bent U-shape, and the supply pipe 27 extends upwardly through the bottoni ol' the druin 5 andl into the chainber (36. For operatin,"y the condenser cold waterpipes67 are provided thereinI und sup plied with eold water from the supply pipe 6H. A\itcr passingr through the condenser t cold water is delivered to the druin 5 by means of :i pipe (Si) where it may be used as feed water. 'lhe lower end of the pipe 62 in the chamber 26 is situated at the level at which it is desired. to maintain the water in the front header lil, that is, at a level sull'icient to flood the lower bank of pipes ll.

Should the water in the chamber 26 he lowered below the. lower end of the pipe 62,

"lhen'steaiyi which collects in the chamber 26 will pass upwardly in the pipe ($2 to the condenser 63.. The steam being condensed in the condenser (l produces a suction or partial vacuum inthe chamber 66, thereby rausing the level of. the water in chamber (lo to be'raised relatively to thel level oi' the water outside of the chamber (16 and in the druni 5. This raises the level of water in the chainhei 06 above the, top ot' the supply pipe 27, causing water to be deliiered through the pipe 27 to the chamber 2() iroin water diuiii 5. Iri order thatthe desired vacuum may be properly proilueed in the chamber 66, and not be too quickly reduced by the admission of too much steam froin the lower end of the pipe 62, there is provided in the pipe 62 a plate 67 provided with one or inoreY small perforations therein.g Thus the passage of the steam through the pipe 62 is much retarded by the perforated plate 67 so as to allow' the formation ot a sulicient reduction of pressure in the chamber 66 to cause water to be sucked upwardly therein in the openings in the bottoni of the chamber 66 from the druin 'lhis action causes water to be supplied to the chamber 2() from which 'it is in turn supplied to the various banks of tubes as already explained. until it reaches. the lower/bank of tubes l( where it will raise the level of the water therein and in the chamber '26 until it reaches and closes the lower end ol' the pipe 62 whereby further adinission of steani to the pipe 62 is prevented thereby causing the action of the condenser (325 to cease, whereupon the level ol` the water in the chamber 66 will not be further increased above the top of the pipe Z7. and further supply of water to the generator is cut ofi'.

lly the means above described the supply of water, to the generator is automatically controlled so as to inaitain the water level in the chainher 26 substantially at the lower end of the pipe 62, and thereby cause the lower bank of tubes F to be eontinuall flooded with water under a suitable hea lIt will be understood ofcourse that if the lower bank of tubes l" is sutiiciently supplied with water, the other banks above will be sulliciently supplied with water, since water can not be supplied to the bank 1 until all of the other banks are properly filled.

Referring to the modification shown in -Figs. 5 and (l, the generator there shown is provided with the usual grate 7() and with a seiiies of banks of tubes (l, Il, l, J, l( and L. The tubes of these banks are all inclined and substantially parallel to each other and arranged closely adjacent to one another as in Fig. 1. Front headers are provided for each bank as at 7l, 72, 73, 74,

75 and 7G, while corresponding,r rear headers any front header to the` rear header of the bank below, pipes uil, 8l, S45, H6'. S7 and H8 are provided, the pipe 83 leadinpr from the front header 7l to the second rear header 7S, the pipe H4 leadingr from the front header 72 to the third rear header 7). the pipe S5 leading' from the i'ioiit header 73 to they fourth rear header 86, the pipe 86 leading,r l'roin the front header 74 to the iifth rear header 81, the pipe 87 leading from the front header 75 to the lower rear header 82, and the, pipe S8 leading` from the front header 76 to the lower rearheador 82. A

fao

supply pipe 89 leads from the stealn and water-,drums 90 to the upper rear header 77, and water may be supplied through said pipe to properly supply the generator in any well known manner. It will be understood that the pipes S3 to 88 inclusive, are arranged at the sides of the various banks o steam generating tubes tl to L inclusive. and preferably in the 'side walls or brickwork of the generator or so that they are substantially outside of the main heat zone. The front headers are each provided with pipes 91 which connect each front header with the header above it, and extend upwardly 'therein sutliciently to allow a propel' depth o1' water to be maintained therein without it tlowing to the header below. It will therefore he clear that the steam which is delivered into the l'ront headers from the various banks of tubes to L inclusive, will readily pass upward through the pipesl J1 into the upper header 71, and thence by pipe 92 into the Steam space ,of the drum 90. 1n case the water in any of the front headers should rise higher than desired, there are provided a series ot' pipes 93 connecting the front headers with one another, having their lower ends sealed in the water in the header below. 1n case the water in any front header rises above the top ot' these pipes it will pass therethrough to the header below, thus supplying water to any bank below which needs thc same. The general operation of this inodilication, as will be readily understood, is substantially the same as the operation o1' the generator shown in Fig. 1.

Referring to l `ig. 7 the mmlilication there shown is provided with the usual grate 100, and with a seriesy o1' banks of water tubes M, N, t). 1 and Q. These tubes are all in clined upwardly toward the front of the generator, and are provided respectively with front headers 101, 10;. 103, 101 and 105. and with rear headers 10o, 107, 10S, 102) and 110. rlhe top front header 101 is connected to the rear header of the bank below by the pipes 111, which is at one. side ofthe steam generatingl tubes and preferably in the brickwork of the generator. The front header 10;), is connected with the rear header ol' the bank below by pipe 112. The front header 103 is connected with the header ol' the bank below b v pipe llll, and the heador 101 is connected with the lower rear header by pipe l1l. tonnected with the lowest rear header 110 by passage 11.3. isa chamber 111i. 1t will therefore be seen that by the arrangement ot the pipes described the water supplying the generator passes successively downward from bank to bank through the pipes 111 to l1l.but that all ol' passes upwardly in the same direction as the water, whereby it is more readily freed f rom the steam generating tubes. Each rear header is provided with an upward extension 117 extending upwardly into the header above, but sealed with respect thereto. Each of the upward extensions 117 is provided with a connecting pipe 118 which extends upwardlyv into the extension 117 of the header above. This arrangement allows of the level ot' the water in the various headers rising up to or above the lower ends of the tubes of the bank above, and also provides a continuous passage to permit the escape ot any air or vapor that may collect in the rear headers so that this air or vapor may pass upwardly through the various pipes 11B to the extension 117 of the top rear header whence it may pass by means of pipe 11.) to the steam space of the steam and water drum 120. Thus thel water is supplied to the lower ends of the steam tubes i'ree from air or vapor. A pipe 121 connects the steam space o1' thealrum 1".0 with the rear header lllt' so that any steam or gas collected therein may he passed to the drum 120. For thc purpose ot collecting the steam delivered to the front headers, the front headers are provided with pipes 122 Connecting eaclr header with the header above. These pipes extend 'upwardly above the water level ol' the header above, and Slightly below the water level o1' the header into which they extend below. 1t will therefore he seen that as steam collects in any of the front headers it a-t tirst has no means of escape there l'rom, but as the steam collects .it causes the pressure in the front headers to slightly rise, thereby depressing the water level therein until the water level is below the lower ends of the pipes 122, whereupon direct and free passage is atlorded the steam through the pipes 12?. to the header above from which it passes in the same manner to the next header above, and so on to the top header 101` where, in a similar-manner, it passes into the steam space ot' the drum 120 by the. pipe 123.

ln order to-properly regulate the supply ol' water to the generator, the sup ly pipe. 194 leads l'rom near the bottom of tlie steam and water drum 120 to a double seated valve 125. From the valve 125 the water is supplied through pipe 126 to the upper rear header 10G. From the upper header 10G water is supplied to the remaining rear headers and banks of tubes in the same manner as described with regard to the modifications shown in the other' figures. For operating the valve -125 the same is provided with a stem 127 which may be moved 'upwardly against the action of the spring 128 the steam generating tubes oil' the banks i\l l in order to supply water from the drum 120 to nielusiye are inclined upwardly in the to the header 106. livotally connected with same direction so that the steam therein l the spindle 127 is a lever 128 which is pivmaar@ oted to the ychamber' 116 at 1.29 Pivotally connected to the dischhrge end of the lever is a lloat 130 floating in the water in the chamber 116. It will be clear that if the level of the water in chamber 116 `drops be- 10W a predetermined point, the weight ol' the float 13() will cause the valve tobe opened against the action o f the spring 128, thereby causing Water to bey supplied to header 106. The level of the Water in the chamber 116 is designed to be such as tvpro erly iood the lower bank of tubes Q in order to keep them at all times as full of Water as possible. As soon as the level of the water in chamber 116 rises sutlieiently, or to the predetermined point as desired, the float 130 is raised likewise so as to close the valve 125 and shut olf the suppl) of water.

In respect to all three forms of generator it will therefore be seen that the water eir culation is by one continuous lieu' through all of the water tubes, first through the upper bank, then through the bank next below, and so on down to the bottom bank or row of tubes. By this'the water is gradually heated until it reaches the bottom bank of tubes where the temperature is greatest, and it is rapidly converted into steam. Since the connectingpipes such as 29, 85C., in Fig. 1, all pass at one side of the banks of steam generating tubes, the generation of steam therein is practically prevented so that practcallyno steam is generated therein which would retarddor. hinder.v the solid body of water from flowing therethrough to any material.extent.r It will of course be under stood that a very small quantity oi steam may be carried alongiwith the water in these side tubes. uml an immaterial amount of vsteam might be generated therein. But the generation of steam therein is cut down to' avery small amount so as not to interfere in any Way with their capacity for conducting the water, and practically all the steam .generated in the generator is rapidly taken oil' at the upper end of each bank of tubes and directly conducted to the steam drum 2 Without having to pass through any part but ythe upper ends of each of the steam generating tu )es in which it is generated. By inclining the steam generating tubes as shown the flow of Water therein'is always upward toward the front header Where the steam is taken off.. Thus the steam in. esca 'iu'gg passes along with the water and tegus to aid in the movement of the water, und the movenn'nt of the water tends to aid in the movement of the steam to get it but of the tubes :is soon as possible in n der that y may he refilled. uitlfwater soon as pos ible. By thus keeping-the steam generating Lubes, and especially the lower bank of tubes, ra )idly filled with water` the eiciency thea-eo' is very considerably creased. l

In some classes of boilers the front header is not made of horizontal sections, and is substantially filled with water to its top. In such case the steam generated at the nl' atei', and water and steam together are dis iarged into the'overhead `drum,rwhich is dismlrantageons. ln my improved boiler, however, the steam generated in thel lower bank of tubes has a free path directly to the steam drum and Hows alone into that drum. lt has been pointed out that the natia' fel through the generator is progress el heated fro-ni the time it enters the bei until it. is evaporated into steam. As u. l 4remliiy appear, this .is done by providing what is like routiunous coil of 'iipest the Water passing as in Fig. l through the bank A and return tubes E29 and 30 forming one coil, then through bank Il and return tubos il! and 32' 'harming the next coil, and so on. The legs of each coil which are subjected to the furnace gas 1 all :nd upwardly to the 'front header 'where the steam is taken oil' from earl log separately from its highest level. The (lewin-smul leg, that is, one cour posed of the return pipes such as 29 and il' passes outside of the boiler proper so that it is not subjected to the furna'ee gases, and little or no steam generated therein. The steam does not have to pass through the return pipes sur-li a" "l and and 31, Sw., in order to ge 5' the steam drum. where, if it didz it wg i ,f uliect on the top surface of the pipes Q5, El? alie.. and form pockets which would not be readily filled with vater, thereby decreasing the eiliciency of the boiler. By quickly and readily removing the steam from the banks of steam t r erating tubes, the same are quickly reilll. thereby keeping all of them linst as full Water as is possible all of the time so that the greatest amount of heat may be taken un so as to cause the greatest trans-mi elleiencv possible. The steam in no y 4 of the boiler has to pass in a direction con trary to the movement of the water but al ways with it, and steam generated in the lower banks of tubes cannot be diverted from its upward i'mssage to the steam drum so as to flow downward through they upper banks of tubes toward the rear headers, as @curs in Certain oihor types of Water tube liiolers. Furthernru-e by providing the wir ter ein; ulaiion so that it downwardly from bank to bank and progres-1lrely hea t- -r-rl. the older water is nu top. and since the older water is muoh more dense than the luf-ated water below it Causes a `greater head te be prtjuluf-ed. thereby making the circulal tion more active and elieient to Vmore rapidlyrefill the banks belowV as may be necessary.

Also by placing the return pipes2 930, 31, 4 82, Sie.. at one Vside or in the brikwork of the gen:.\rator, the steam generating banks lower tubes has to pass through all this head f lll) 1 lil may be arranged closely adjacent to one another so as not only to minimize the size of .the boiler as a whole, but to get the greatest is carried'to the chambers 21, 22, &c., where it is allowed to escape freely by means of pipes 43 to the steam drum 2.

A further advantage in having the coldest water in the top banks of the boiler, and the hottest water in the lowerbanks, is that as the heated gases of combustion pass upwardly they are of necessity more or less cooled so that in abstracting further heat energy therefrom the colder the pipes are at the top the greater amount of heat energy will be taken from these gases. This of course increases the eliiciency of the boiler and at the same time allows the boiler to have all the other advantages pointed out.

A further advantage of the progressive circulation and heating is that in all such boilers there is a certain amount of scale which is thrown down in the tubes of the boiler and in many forms this is precipitated in the lower bank of tubes where because of the excessive heat it is baked hard upon them, but in the form of boiler which I have described any scale which enters the generator would be first thrown down in the upper banks of tubes, and before it reaches the lower bank of tubes. Being thrown down in the upper bank of tubes it does not bake hard upon them because they are not so highly heated and it may therefore be more easily removed. Since this scale and these impurities are not thrown down in the lower banks of tubes nearest the fire, it leaves the lower tubes always free whereby they are able to generate steam at the position of greatest efficiency and the heat-conducting power thereof isy not diminished. This is of very considerable importance since the greatest heat rtransmlssion takes place at the lower tubes, and it is im yrtant that these be kept clean in order t at the heat transmission thereof may not be diminished. The efiiciency of the boiler is not so materialy decreased because of the deposit of softer scale in the upper tubes as the relative heat transmission of the upper tubes is comparatively smaller. 'l`he water therefore arrives at the lower banks. of tubes pure and very much heated. Each section discharges its steam as rapidly as it is generated, and gets rid of any excess vof water with despatch above the quantity needed forA the section to perform its perfect function.

It will further appear that the pipes 43 connecting the various front headers connect only with the top parts of said headers so that only steam gets into them, and they .the sprin are not blocked in any way by water but are always kept free forv the passage of steam to the steam drum 2.

Referring to Fig. 1 the cold feed water, aside from the quantity introduced in the condenser 63, is introduced into the second drum 3, which being placed over the heating chamber of the boiler, absorbs a certain amount of heat. The water then flows to the drum 4 where it continues to absorb more heat, and thence to the drum 5 where, after absorbing more heat, it is supplied through the pipe 27 to the rear header 20. By extending the chamber 66 as nearly as possible to the bottom of the water drum 5, it will be seen that practically the entire water contents of the overhead water drums is available to supply the water tubes below. Thus if the attendant neglects to keep the water drums at any predetermined fullness, or should the water feeding apparatus be stopped due to carelessness, or due to accident, substantially the entire remaining contents of the water drums will be available to supply the boiler tubes with water. Thus no exact predetermined water level in the overhead drums is made necessary. The pressure-operated device for regulating the flow of water tov the water tubes of the generator, shown in Figs. 1 and 2, entirely eliminates all valves and other parts mechanically moved. The perforated plate 67 may be provided with several small perforations so that there is no substantial danger of Lthem all becoming stopped at the same time by foreign particles or the like. If desired, an ordinary gate, globe or plug valve, could be substituted for the plate 67, or a ball, Hap or mushroom check valve could be similarly substituted, which would close au# tomatically when a certain vacuum pressure was reached, admitting successive arr'vunts of steam afterward as the intensity 0I the vacuum diminished, all of which devices are known in places desiring similar service. The baffle 57, shown in Figs'3 and 4, is especially eliicient in that it can'be very easily removed. Upon the removal of the Ubent pipes 43 the batlles 57 are easily slipped out, thus leaving the openings free for the removal of the steam generating tubes 6 or for cleaning as desired. If desired the baille 57 may be made integral with the. pipe 43,

therefore making it unnecessary t0 fit the baffle into the headers 7. The mclusion of packing ring 51 prevents any leakage o 'team and water around theseats of the pipes 43.

From the above it will be clear thatI have providedy an exceptionally eiicien steamgenerator of simple construction in which the .water is progressively heated and caused to ,pass vprogressively downward from bank to Ibank of steam generating tubes, out in Cil which the steam always passes in the same direetion with the water in the steam gener ating tubes. and in whieh the steam is taken otl at the upper ends of eaeh bank ot tubes and allowed to pass directly to the steam drum, whereby the water eireulation rendered most etlieient, and the water arrives at the bottom banks of tubes in a most heated and efficient condition for the rapid generation of steam. l `urthermore, by passing the return pipes 29 to 31. &e.. outside of the banks of steam generating tubes. and substantially outside of the main heat zone, the steam generating tubes (i and i' may be plaeed closely adjaeent to one another and in staggered relation so as to absorb the greatest amount ot heat trom the hot gases. Furthermore, in placing the return pipes '225), 31, &e., outside as deseribed. no substantial amount of steam is generated therein, so that the water is given a most free eireulal tion. By the eonstruetion of the boiler noted l may be pushed or forced very l and the generator mueh above its rated capacity most eilieient manner.

In Fig. 8 l have illustrated a modified Aform whieh embodies some of the novel traA tures of my invention but which is far interior to the eonstruetion illustrated in Fig. 1, ete.

ln the modification yshown in Fig. S. 130 represents a steam and water drum with a supply water pipe 131, and steam outlet 132. i .\s in the other tigures this Construction is l i i in a provided with front steam headers 133, 131, 135. liti and 137, and with rear water head ers 138, 139, 140, 111 and 142. Extending downwardly from the front to the rear headers are banks ot steam generating tubes lt, S, T, U and V. Feed water is t'ed from drum'1l0 to lowerl rear header lili by means of pipe 14B. The water then llows through the set-tion of steam generating tubes V and that whieh is not. transformed into steam is poured into the troutI header .137, whence it is earried to the next rear header 111 by side pipes 1li. \\'here the pipe 14-1 enters the header 111 it is provided with an elbow' 115, one end 11T` eonneeting with the pi ie 1H and the other end V14o leading to tiie header l-l'l. This elbow also has leading trom its top a pipel 111i ,which extends up wardly and into the steam spare of the steam drum lili). rl`he bottom ot the elbow is strluk up as at llt) in order to form a sort ot' baille whieh aids in separating any entrained gases troni the water. eauses thel gases to be directed upwardly into the pipe liti whence they are carried to the steam drum. while the water drops bark and flows into the rear header 111 through the end 1i??l ot the elbow. Tater from the rear header 111 then flows upwardly through the steam i generating pipes ll into the upper header '18o from which it tlojws through side pipe Vdrum 130.

150 to the next rear header 140. The water then carried progressively upward through the steam generating tubes T, S and R. and the side pipes 151 and 152. The water is eaused to flow upwardly in the path deseribed by means of the head of water in the feed pipe 143 and drum 130. .\n v entrained gases passing through thel pipes 1li, 150. 131 and 152 are earried o by the pipes 14o, 153, 154 and 155 respectively. Where 150` 151' and 152, are eonneeted to the pipes 153, 1M, and 155 and the headers 140, 139 and 138, they are provided with elbows similar to 145. Any steam or gas whieh might eolleet in the rear header 14'.) is earried to the steam drum 130 by means of a pipe 151i leading from the top of the header. For the same purpose pipes 15T. 15S, 159 and 160 lead from the top of the headers 11h 110` 135) and 13S and eonneet with pipes l-lti, 153, 1511 and 155 so that any steam or gas which might eolleet in any of the rear headers will be properly eonduend to the steam drum.

ln order to conduct the steam collet-ted in the t'ront .st/earn headers 133 to 13T to the steam drum, pipes 161. 169, 163. 164 and 16.7 are provided eonneeting the steam drum with the header 133 and eaeh front header with the header below. The lower ends these pipes are beveled otf as at 166 and normally the water level in these headers is at the lower ends of these pipes. The steam generated in the section V being conveyed to the header 137 Causes the pressure. therein to inerease so that the water level therein is depressed until the` lower end of the pipe 165 is unsealed when the steam will pass upwardly to the stam spaee in header 13G. llere the same aetion will be repeated and so on up through the front headers until the steam reaches the steam spaee in the It will be noted that in this modiieation the water is fed upwardly through the generator so that this eonstruetion does not have the great praetieal advantage of the downward feed shown in the other tigures. vllowever it has eonsiderahle advantages over some prior structures and might be found desirable in some, eases.

Although l have deseribed my improvements in great detail and with respect t0 eertain particular t'orms, nevertheless many changes and moditieations may be made therein without departing from the spirit and seope of my invention. and l therefore do net desire to be limited to any of the details shown and deserilied exeept as elearly speeilied hereinafter in the appended claims.

llaving thus fully and elearly described in v improvements. what l rluim as new and desire to secure by Letters latent, istv l. ln a steam generator. ,i plurality of steam generating tubes` all inrlined in the Same direetion, a header for eaeh end of Abanks of inclined steam generating water tubes, front and rear headers for said banks.

said tubes being substantially all inclined in the same direction and means for admitting water to the lower end of each tube and causing the water to pass progressively downwardly through the successive banks of tubes.

3. In a steam generator, a plurality of banks of inclined steaml generating water tubes, front and rear headers for said banks of tubes, and means for conducting water from the front header of one bank of tubes to the rear header of the bank below, said means being situated outside of the main heat zone whereby steam is not materially generated in said means.

4. In a steam generator, a plurality of inclined water tubes, and means for conducting water from the upper end of one tube to the lower end of the tube below, said means being situated outside of the main heat zone whereby no material amount of steam is generated in said means.

5. In a steam generator a plurality of banks of inclined water tubes, the tubes of each lyin substantially parallel to one another an` extending in substantially a common plane, whereby the space occupied by t'he tubes is reduced, and means for conducting the water from the upper ends of each bank of tubes to the lower ends of the next succeeding bank of Mtubes below.

6. A water tube steam generator having setsof steam generating water tubes, means for causing water to pass successively through the tubes from set to set and down ward until it reaches the bottom set, and means for automatically maintaining a predetermined water level in connection with the supply end of the lower tubes.

7. In a steam generator a plurality of inclined'water tubes, the upper end of one tube being above the lower end of the next succeeding tube above, and means for conducting the water from the upper end of each tube to the lower end of the next succeeding tube below.

8. In a. steam generator the combinationk of front and rear headers, a plurality of banks of water tubes extending upwardly from the rear to the front headers, said banks lying closely adjacent to one another, and means for conducting the water from the upper ends of each bank of tubes to the lower ends of the next succeeding bank of tubes below.

9. In a steam generator the combination of front and rear headers, a plurality of water tubes, all of said tubes being inclined in the same direction whereby said tubes may be placed closely adjacent one another, and means for conducting the water from Vthe upper end of one tube to the lower end. of a tube below.

10. In asteam generator the combination of front and rear headers, a plurality of banks of water tubes, all of said tubesl being inclined in the same direction whereby said banks may be placed closely adjacent to one another. and means for conducting the water from the upper ends of one bank of tubes to the lower ends of a bank of tubes below, said means embracing water conducting mcans lying outside the main heat zone. whereby generation of steam therein is substantially prevented.

11. In a steam generator a plurality of inclined water tubes. the upper end of one tube being above the lower end of the next succeeding tube above, and means for con ducting the water from the upper end of each tube to the lower end of the next succeeding tube below, said means embracing water conducting means lying outside the main heat zone whereby generation of steam therein is substantially prevented.`

12. In a steam generator a plurality of banks of water tubes, front and rear headers therefor, said tubes extending upwardly from one header to the othbnand lying in substantially parallel planes whereby the space occupied by the tubes is reduced, and means for conducting the water from the upper ends of each bank of tubes to the lower ends of the next succeeding bank of tubes below, said means embracing water conducting means lying outside the main heat zone.

13. In a steam generator a plurality of inclined water tubes, lying substantially parallel to one another, whereby the space occupied by the tubes is reduced. and means for conducting water from the upper end of each tube to the lower and of the next succeeding tube below, said means embracing water conducting means lying outside the main heat zone wherebj.7 generation of steam therein is substantially prevented.

14. A Water tube steam generator having all its steam generating tubes inclined and fed with water at their lower ends whereby the water passes upwardly in said tubes with the steam generated, said tubes being arranged in banks and means passing at one side of said steam generating tubes for conducting water from the upper ends of one bank of tubes to the lower end of the bank of tubes below.

15. A steam generator having a plurality of banks of steam generating water tubes lying substantially parallel to one another, and means for conducting water from the upper eiuls of the tubes of each bank to the lower ends of the tubes of the bank below, the lower ends olf the tubes oi one bank being below the upper ends of the tubes of the next succeeding bank below.

'1(3. A steam generator having;r a plurality of inelineil water tubes lyingr in banks, front and rear headers for said banks, the rear header of each oank lying lower than the, front header ot' the. saine bank and conneetingr means` whereby the water flows upwardly in nach tube. but downwardly from `oank to bank.

l?. A. Water tube steam generator baring steam generating water tubes inclined upwardly in the same direction, and meansV for supplying water to the lower ends 0I" said tubes and musing it to pass successively downwardly through said tubes to the bottom tubes of the generator.

18. A Water tube steam generator having a series ot steam generating Water tubes inn rlinefl upwardly and arranged in banks vlosely :fuljxuff'nt one another, a front and rear beafler for each bank. and eontlueting pipes for ronilucting water troni the upper bender ol' ea/fh bank to the lower header of the bank below.

l?. A water tube strani generator having a series of steam generating water tubes inelinerl upwardly and arranged in banks. elosely arljarenl one another. a` front and rear hea'ler 'for each bank. andv conducting! pines for eonflueting water from the upper header of eat-h bantl to the, lower header of the bank below. said pipes being outside the main heat Zone of the generator whereby the generation of steam is substantially eliminatorl therein.

20. Water tube steam generator having a Ceries, of steam `generatingl inf-lined water tubes. front unner headers for the tubes. rear lower headers for Parli bank. a pluralit \Y of Chambers. one eorresnonfling to ear-h rear bearler` means for combating water troni earb ebamber to its rorresnorulin;7 rear header. and means, for ronrlur'ting Water from each front hearle." to the ebarnber corresponding to the rear bearler of tho bank below.

21. A Water tube Steam generator baring a `series of Steam generating inrlnetl Water tubos arranged in banks. a front uriner header for each bank. a rear lower heaeler for nach bank. a plurality of chambers. one ooi-responding' to each rear hearler. means tor eonrluetinff water from each chamber to its rorresponflinq rear header. and ,means for ronrluetinf Water from nach front header to the nbamber corresponding; to tle rear lieafler oF the bank below. ami mea s for takinfr ntl steam which may vollect in saifl Chambers.

ln a steam generator a nluralil'v of banks of Water tubes, front and rear headers eoulufting tbn Water from the nl therefor, tubes extending irwarilly from one header to the other and ying in substantially parallel planes whe-.mbv the space oeeupied by the tubes if; reduced, and means for (mitlicting the. Water from the upper ends at' each bank of. Sutra to the lower ands; of the, next sue; .eili of tubes bel-nui, and means for colle: team from the headers at the upper ends of ...ufl tux. 23. ln a steam generator tbe. combination of front anill rear headers. nlurality of wat-er tubes ex'wntlingf una' from, the rear to the front header s, .ping closely :uljafent one anoihe and means for per enf of a tube to the lower enfl of tbe nekt snreeediup; tube below. a steam -lrunih and i ,cr rondueting steam direetly from nach front header to the steam drunL Q4. In a steam generator a. plurality uit banks ot inclined Water tubes. the ngz-per enfle; of one bank of tube' beine; above. the lower ends of the next aimee-ling bank ot tubes above. and means for eoifnlnrti' e' tbe Water from the upper ei l or" eaen bank 9@ tubes to the lower enrla or the nextsucceed-- ing bank of tubes below sind means embraning water nominating means lying outside the main heat zone Wherebv .steam will not be materially ,generated therein.. a steam flrum. :incl means for conducting steam l a5 (ii-- reetlv from the upper enti of eanli tube to the steam drum.

A. water tube steam generator havingv a series ot' steam generating inflinetl water 10a tubes arranged in banks. a front upper header for nach bank. a rear lower header tor each bank` a pluralityr ol wliarnbers. one Corresponding to earh rear beafler. means for comluftiue Water from earh rhamber to 195 its enrresporuling real' lmarler :intl means tor rnnfluvtin;r water trono e: front, bearler to the rbarubnr eorresnonrllnff to the rear lioarler ot' tbe bank lit-bmg a team elrmu, means for rmuluftins steam 'lifun earl Nin front bfaflrr flireftlv to the ,strani elruin. and means for wonrlurtiug steam bieb mar rol lent in swirl r-banibers flirertly io the steun (lrum.

96. A water tube .steam Qenf'rator l'mvingz 115 a series ol' strain fneral'ing n.1* nerl water tubes arranged in banks. a front unna. header for eafh bank. a rear lower header for each bank. said tubes all extending sub stantiallv parallel to one another anrl saiil 126 banks lvingr closel;v atliarent one another. n steam (lruni. means conducting tbe steam from ear'b front hezuler rlirefftlv to tbe steam drum without passes through said tubes. anil means for eontlufting: water from each 125 front header to the rear header nt the, next lower bank ot tubes. sairllast mentioned means passing! at one side of said banks of tubes anrl lying substantiall)Y without the main heat zone 'of the generator whereby 130 the generation of steam in said last men* tioned means is substantially eliminated.

27. In a steam generator a plurality of banks of water tubes, front and rear headers therefor, said tubesI extending upwardly from one header to the other and lying in substantially parallel planes whereb the space occupied by the tubes is reduce and means for conducting the water from the upper ends of each bank of tubes to the lower ends of the next succeeding bank of,

tubes below, steam conducting pipes for connecting each front header with the front header below and baliles in front of the ends of said pipes.

28. In a steam generator a plurality of banks ofwater tubes, front and rear headers therefor, s'aid tubes extending upwardly from one header to the other and lying in substantially parallel' planes whereby the space occupied by the tubes is reduced, and means for conducting the water from the upper ends of each bank of tubes to the lower ends of the next succeeding bank of tubes below, steam conducting pipes for connecting each front header with the front header below and bellies in front of the ends of said pipes, each baille comprising a tubular shaped member closed at its end farthest from said pipes and cut away on its top side and provided with an aperture in its bottom.

29. A steam generator having aseries of steam collecting headers, steam conducting pipes for connecting the front of each header with the front'of the header below and baffles in front of the ends of said pipes, cach baille comprisingl a tubular shaped member closed at its end farthest from said pipes and cut away on its top side and provided with an aperture in its bottom.

30. A steam battle for steam ygenerators comprising a tubular shaped member closed at one end and open at the other and cut away on its top side and provided with an aperture in its bottom.

31. The combination of a plurality of headers for steam generators, said headers being arranged one above another, steam conducting pipes for connecting the front of each header with the front of the header below, said headers being provided with openings for the rreception of the ends of said pipes. and removable batlies opposite the ends of said pipes, carl`y balile comprising a hollow shaped member closed at its end farthest from said pipes and havinga Harige fitting within the header opening and the baille being cut away on its top side and provided with an aperture in its bottom.

32. A water tubo steam generator having substantially all of its steam general lng water tubes inclined in the same direction and means for causing the water to pass successively downwardly from tube to tube until it reaches the bottom tubes.

33. A water tube steam generator having sets of steam generating Water` tubes one set above another and means for causing water to pass successively through the tubes from set to set and downward until it reaches the bottom set, and means for automatically maintaining an independent water level in connection with the supply end of each set of tubes.

34. A water tube steam generator having substantially all of its steam generating water tubes inclined inthc same direction and means for causing water to pass successively downward from tube to tube until it reaches the bottom tubes, and means for automatically maintaining a predeteriif-.ined water level in connection with the supply end ot' the lower tubes, said means being artuated responsive to variations in said water level from a predetern'iined point.

35. A unter tube steam generator having substantially all of its steam generating water tubes inclined in the same direction and means for causing water to pass successively downward from tube to tube r-itil it reaches the bottom tubes, and means for automatically maintaining a predetermined water level to tiood the lower tubes, said means 'embracing a supply pipe, a steam and water f chamber, a steam pipe leading to said chamber from the water level .in the bottom tubes, and a condenser for condensing steam in said chamber tocause the pressure without said chamber to raise the level of the water therein so las to feed said supply pipe.

36. A water tube steam generator having its steam generating tubes arranged in series and means for automatically maintaining a predetermined water level to flood the lower tubes, said means embracing a water supply chamber and means for raising th'e water level in said chamber by the con en- 'sation of Ysteam and reduction of pressure.

37.- A water tube steam generator having its steam generating tubes arranged in banks and means for automatically maintaining a predetermined water level to fiood the lower bank of tubes, said means embracing a supply` pipe, a steam'and water cham` ber, a steanrpipe leading to said chamber from the water level in the bottom tubes, and a condense;` for condensing steam in se id chamber to vcause the pressure without said chamber to raise the level of the water therein so as to feedfsaid supply pipe.

38. In a steam generator a plurality of banks of water tubes, front and rear headers therefor, said tub'es extending u w rdly :from one header to the other and lyi'iig in substantially parallel planes whereby the space occupied by the tubes is reduced, kand means for conducting the water from the from the headers at the upper ends of saidv tubes, and means for cond noting away steam from. the headers at lower ends of the tubes.

39. A steam generator' composed of successive 'banks of straight water tubes, front and rear headers therefor, said tubes being all inclined in the same direction, all of said tubes receiving their supply of water at their lower ends and from the bank of tubes above after said water is freed from steam, and 'then discharging the steam generated in said bank of tubes from the upper ends into the upper part of the front headers, a steam drum and means for conducting the steam from the headers to the steam drum.

40. A steam generator composed of suc eessive water tubes all inclined in the same direction. front and rear headers therefor, and means whereby all of the tubes receive their supply of water at their lower ends and from tubes above after said water has been freed from steam generated in the tubes above.

4l. A .steam generator composed of steam generating iin-lined water tubes arranged in banks and in which the steam generated always nous upwardly and with the water i lig# all the water tlows downwardly trom bank to bank whereby the` water is progressively heated, and means for eollerting the steam at the upper ends of the banks.

42. A steam baille lor steam generators comi ising a hollow member closed at one mld and open at the other and out away on its top side.

43. A steam goueratorhaving a series of .steam rolleeliug headers. steam conducting' hiper-z for connecting the front 0i' oooh luwuleirwitli the iront olthe houder below and bullies in front ol the ends of said piprm earl. baille roiuprisuiy.' a hollow lueur l-ei' Closed at ils, end 'farthest trom said pipes. open at its und nearest said 'pipi-VS. and a runaway on its top side.

1H. ""iter tubo steam generator llariiitf fsu all ot' its steam generating water tubos inclined iu tile same dir and means for causing water to pal. sur wfssirrly ieunu'ard through :aid tulwsuutil it wailws the liotroin tuiles. :mil nuuus 'oi automatically maintaiuiu;r a iiredetermlumi f' loro! lo flood thrlower tubes. said wnlvrsuing a water drum. a supplyY :i steam and water rhauilier open at itsl lrotiu'f: and extending irly to the bottoni of the water drumh a Steam pipe *railing i, said miamber from ther water level in t bottoni :uhr-s a wrtorated plate in said pl ,e to Vrslrir the pas ige ot steam there:-

trough. and i coude r for rou(lensing` om: in ufl ehauibor to cause the pressure without said chamber to raise the level of the water therein so as to feed said supply pipe.

l5. A steam generator comprising a series of water tubes connected to form a series of loops in series with one another whereby the supply water will be fed progressively downward through said loops, each loop having two legs both extending downwardly from their point ot' connection and means for collecting the steam genen ated from the upper end of each loop.

L16. A water tube steam generator having substantially inclined generating Water tubes, means for causing Water to pass successively downward through said tubes until it reaches the 'bottom tube7 and means Yfor automatically maintaining a predetermined water level to flood the lower tubes, said means embracing a water drum, a simply pipe, a steam and water chamber open at its bottom and extending nearly to the bottom of the water drum, a steam pipe leading to said chamber from the water level in the bottom tubes, means adapted to rest-riot the passage of steam therethrough, and a. condenser for condensing steam in said rhamber to cause the pressure without said fhamber to raise the level of the water thereiu so :is to feed said supply pipe. 95

4T, ln a steam generator a plurality of sections of inclined generating tubes, a header for each end of each section, means for taking olf steam from the headers :it the upper end ol. each section, and means for 100 conducting water from each of said last mentioned headers to the lower header of the next succeeding section.

4S. The combination of a plurality of invlined steam generating water tubes, front 105 and rear headers therefor, means for taking olf steam from the upper header of each tube. and means for causing Substantially all the water passing through a tube to pass lo the lower header or' a lower lube.

49. Thecoinbination of a plurality of inclined steam generating water tubes, means for taking olf steam at the top end of each tubi, and means for conducting substanlially all of the water passing through a 115 tube io the lower and of an adjacent tube, aid rouducing 'means` being outside the main hout Zoneso that the generation of team (herein substantially eliminated.

The combination ot' a plurality of ln- 12o vliuod steam lgeneratirig water tubes all inrliued in ilie saine general direction, means l'or tairiuej otlsteam at the top end of each rabo and means for eondaetiug substaniially all of they water pass 'r through a 125 tube to the lower end of an :u ,aeent tube, said eondui'fting means being outside tl'i'e main heat zone so the generation of steam therein is substantially eliminated.

5l. The combination of a plurality of inA 13g clined steam generating water tubes, means for taking oil' steam at the top end of each tube, and means for conducting substantially all of the water passing through a tube to the lower end of an adjacent tube.

The combination of a plurality of inclined steam generating tubes, means for causing substantially all water passing through a tube to pass to the lower end of a tube or tubes below and means for taking off the steam from the upper ends of said tubes.

53. The combination of a plurality of banks of inclined steam generating water tubes, headers for both ends of said tubes, means for causing substantially all the water passing through one bank of tubes to pass to the lower end of the tubes of a bank below to supply the same, and means for taking off steam from the upper end of each bank.

54. A Water tube steam generator having all its steam generating tubes inclined and .fed with water at their lower ends whereby the water passes upwardly in said tubes with the steam generated, said tubes being arranged in banks and means passing at one side of said steam generating tubes for conducting water from the upper ends of one bank of tubes to the lower end of an adjaeent bank of tubes.

55. A water tube steam enerator having all itssteam generating tu s inclined and fed with water at their lower ends whereby the water passes upwardly in said tubes with the steam generated,- and means for conducting water from the upper end of one tube to the lower end of an adjacent tube and so on, and means for taking off steam from the upper ends of each of said'steam generating tubes.

56. In a steam generator a pluralit of ,sections of inclined generating tubes all inclined in the same direction, a header for each end of each section, means for takin off steam from the headers at the upper en of each section, and means for conductin water from each of said last mentione headers to the lower header of the next sueeeeding section.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALBERT A. CARY.

Witnesses GoknAM CROSBY, EDWIN VEGER.

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