US1065418A - Flash-boiler. - Google Patents

Description

W.` H. WINSLOW.

FLASH' BOILER.

APPLICATION YILED JUNE 14, V1909.

Patented June 24, 1913,

6 SHEETBHEET 2.

www1,

w. 11. WINsLoW. FLASH BOIL'EE.

APPLICATION FILED JUNE 14, 1909.

1,065,418 Patented June'24,1913.

6l SHEETS-SHEET 3.

W. H. WINSLOW.

FLASH BOILBR.

- IAPPLLGATION FILED JUNE 14, 1909.

Patented June 24,1913.

6 SHEETS-SHEET 4.'

Window lil NN l- VVE/25 7165565 x and Which-is illustrated in the accompany- (supplied to the boiler in a quantity corre- 1 from the -n'ater supply to the steam recepta- VState of Illinois haVejnVented certain new plied outside C-f the tube to a sufficient tem- 'iit this manner` are comparatiyelyheavy and -case When'tubes Oi' comparatively lar-ge cli- 1 UNITED A:Sire-@ES PATENT WILLIAM II.. WINstow, or cIIIOAGo, ILLINOIS, Assistme TOL- THE s rEAIvIroWEPL DEvICEs COMPANY, OF CHICAGO, ILLINCIs, A CORPORATION or--ILLIItoIls' g-`l .Application med :nine 14,

To all whom mit] concern.'

Be it known that I, IVILLIAAt H. VINS- Low, a citizen of-,the `United States, and resident of Chicago7 countyot- Cook, and

and useful Improvements in Flash-Boilers, of which the followingis a specification,A

ingdrawings, forming a part thereof. I

My. inyention relates to that class of bollers known as lashiboilers, in w-hich one of the essential features is that water supplied to the boiler shall. be converted instantly in'to steam.- In boilers of thistype practically no' water supply is maintained in the boiler; butv on the other hand the water is spending to the'amount of steam to be produced. In the past it has been proposed to accomplish .the instantaneousconversion eztend for a considerable length-through a highly heated zone,the lengtlrof the tube or pipe' being sufficient to. so heat Athe Water a's to convert it into steam. For -boilers of any considerablev capacity this has vnecessarily resulted in the use 'of a tu'be of such a diameter that. the water flowing Atherein 'could not at once beraise'd'by the heat apperature to convertit-into steam, and as a' result the tube, has necessarily' been constructed of great length to give'the necessary heating surface. Boilers constructed diiiichltto make and repai1,"also on account ot' the large volume Lot' water flo-wing through the tube .it is a very diliicult matter to properly regulate the amount of water supplied t'o the boiler to nleetthe yar-ying demands placed -`upon itduring actual use.

Bymy invention I conduct the water' tobe heated in aplurality of parallel paths cle. Each of these'paths consists ot a tube of comparatively small bore, formed preferably in a plurality otvertically disposed loops to contain the necessary length of tube in lsmall compass. ySince these tubes are oitl small bore it is not necessary .that they be of great length. as the heating surface is much larger in comparison to the volume of water flowing through the tubethan is the June-24, f'191 3.

.aineter are used. By my constructionl am able to reduce the size 'of the tubes tol such an extent thatmaterial such ascopper or brass, which has heretofore been' considered too weak to use. for this-purposes may be employed with -safetyvan'd the desirable `re-` sults Ot non-corrosion, ease of working and high .heat conductivity may be secured.

My' invention `furthery consists `in so arranging the parallel looped-tubes that the water from the water connection orreeepta.-

cle is introduced,gradu-allyiinto the heatingzone. Thismay be accomplished in a number of ways, as I `have shown in this application-for instance, the tire may be graduated. so as to be of less intensity atthe end of the tubes connected to the water receptacle and increased in intensity #toward the steam receptacle, or aga-im loops inthe tubes may be shorter at the ends connectedtothe water receptacle and gradually-increased in length toward the steamreceptacle, ora similar resul'tmay be accomplished .by causing the heat from'there to'pass horizontally through lthe looped tubes, beginningat the ends of the tubesconnected tothe steam receptaclerras aresult of which the heat is absorbed in a large'part before it reaches the ends of the tubes connected to thewater receptacle; Another vway' in which' this rresult mayv be accomplished is by constructing the tubes of smaller diameter attheends connected' to the waterreceptacle and gradually increasing the diameter. toward the ends connected tothe steam receptacle.'

invention further consists in the arrangement of an emergency section "of tubes that may be` used temporarily incaseot' overload O rin case the main section of the boiler is disabled. Means are employed with thisconstruction tof. operativelyv connect either the main section or theemergency section, or both, as desired i My Invention furtherqconsistsiu providing means for equalizlng the water vdistribution vtrom the water receptacle to theplurality ot' tubes connected' therewith; 'in order that each tube may' perform its propershare of the work and that at no time any ot the ubes may be filled with water.

In carrying out my inven'fio'n I employ an improved form of burner` which I have found to be cheap to manufacturev and 'very etliective in operation.' v

My invention also consists lin housing all of 'the portions of the boiler and burners in such a manner that their operation may be edective and that the parts may be readily removed for inspection or repair.

rlhe several drawings illustrating my invention are as follows -Figure 1 is `a vertical sectional View through my boiler, tal en along the line 1--1 in Fig. 2; Fig. 2 isa'plan view of the boiler with a portion of thetop and tubes remo-ved to show the arrangement of the burners; Fig. 3 lis a detail view of the steam header or receptacle and shows the thermostatic means employed for controlling aportion of the fire by meanns of the temperature of the steam produced; Fig. 4 is :i sectional view taken'through theV ioint formed between two 'of the loops `ofthe tube shown in Fig. 1 and is taken along the line 6-6; Fig. 5 is a detail view of a looped tube of the conformation shown in Fig. 1*, the tube shown in this ligure being of increasing diameter from the water receptacle to". the steam receptacle; Fig. 6 shows a modified.

` form of tube construction, in which the loops are gradually increasing in length from the 'water receptacle-to the steam receptacle; Fig. 7 is a sectional view of the parts shown in Fig. (i, taken'along the-line tudinally of the boiler a modified form in which the heat fromthe burner is caused the water receptacle; Fig. 11 is asectional view throgh a union used-to connect one of the tubes to the water receptacle. ln this union there is shown the means employed to equalize the water distribution to the several parallel tubes connected to the water header or receptacle; Fig. 12 shows anv arrangement of boiler casing in which a feed water heater is located above the tubes of the boiler. v

Similar letters refer to similar parts throughout the several views.

As shown in Figs. 1 to 4 inclusive, my boiler consists essentially of a water header or receptaclev 20, to which a plurality of tubes 21 are connected by means ofv unions' l22. The tubes 21 are bent into overlapping loops as indicated, which loops are disposed in substantially vertical planes and extend from one end to the other of the tubes.A At

their right hand ends, as shown in Fig. 1, the tubes are connected by means of unions 23 with a steam header or receptacle 24. The relation of the unions 23 to each other is shown in detail in Fig. 3. Each of the tubes 21 is secured together at its points of overlapping,as indicated in Fig. 4, by means of brazing or welding, which latterkmay be Locatie accomplished by the oxy-acetylene flame, or they may be secured together at these points by means of suitable clamps. cured together, each tube constitutes practically a truss and results in a very rigid construction requiring no particular support other than thatnaturally received from the casing of .the boiler. Each tube thus formed is substantially vertically disposed in a continuous plane and all ofthe tubes together,

As thus selocated side by side between the water A of tubes that may be used in parallel arrangement. While the capacity of each tube is small,y the combined capacityof all the tubes may be as large as desired.

A partition 38 is disposed vertically in the boiler. casing between the main burner and the burner 25 which is thermally controlled by the temperature in the steam 'receptacle 24. The partition 38 consists of a reinforcing central portion of metal, as steel, upon either side of which insulating material is secured to prevent. the ready transfer of heat from one portion of the boiler to the other. i

They looped tubes, the water and steam receptacles and the several burners are all inclosed in a common casing 39 of sheet v metal, which is lined with heat insulating material 40. A. cover' 41 is provided, which has secured to its under side a layer of similarl insulating material 42. The edges of the cover 41 are bent down as indicated at 43 to enter 2t groove or channel 44 formed around the .upper edge of the side walls of the boiler casing. The groove or channel 44 is filled with insulating material after the cover is put in place, such material being in the form of paste preferably, which in drying out .forms a Seal and yet does not i prevent the ready lifting ofthe cover in case of accidental explosion of the boiler. The unions 22 are surrounded vby a wall 45 to protect them from the action of theheat. The unions 23 are similarly surrounded by a protecting wall 46. rllhe casing 39 carries ih'its lower portion a drawer or'tray47 which'is arranged to support the several burners 24, .25 and 31 in such a manner that all of these burners and the fuel heat coils disposed above them may be removed from the casing when desired without disarranejement of the burners and fuel coils.

lThe drawer or tray 47 is lined with a heat insulating material 48 to protect the casing and drawer and to also prevent undue radiation of heat from'l the boiler.. The water and steam receptacles -and 24: are supported at theiren'ds by the 'casing' 39and the tubes Where they pass over the partition 8S rest in not-ches formed therein, as a result of which by removing the cover 4l all of the tubes and .the Water and steam headers, together with the partitions and 46, may be removed in their assembled condition for purpose of inspection or repair. Furthermore, Without removing vallof the I tubes and the vtater and steam headers,

any tube may be removed by4 undoing its unions 22 and 23 and lifting such tube from the boiler.

Flues for receiving tlie'products of combustion are indicated at 49 and 5@ in Fig. l; The connection of the several tubes 2l to the ,steam receptacle 24 is indicated in Fig. 3. -v

In Fig. 5 there is shown the manner of constructing the tubes 2l by which these tubes may consist of a plurality of sections of different diameters. As shown in tliis Aconstruct-ion a portion ofthe tube 21 connected to the Water 4receptacle 20 is of comparatively small diameter and is connected b'y'the coiipling 2la to a second ysection of the tube 2lb of larger diameter than the secticn indicated at 21. Section 215 is in turnA connected by a coupling 21c with a third sectin '21d of larger diameter than the section 2lb. The section 2ld is connected? to the steam header or receptacle 24:. This construction provides an mcreasrngjcross 'section for the accommodation of the steam produced as the Water progresses from the water receptacle to, the steam receptacle. This-is as it should be, since the Water occupies very much less space in that vportion of the tube adjoining the Water receptacle from what it does in the portion of the tube nearer the steam receptacle after having' Abeen converted into steam. By the construction indicated it is possible to propertion the tubes for any particular operation .found in practice and` to provide aA cross section sufficient in every ca se to take care of the steam produced Without offering seriousresistance to the How of the steam. 'through the tube. The operation described is further provided for by means of mecha' nism I prefer to use in 'connection with the .through all of the apertures 22.

4and the steam receptacle 2,4'are formed so 'that the lower ends'of the loops are prac- 'l This mechanismA of water which may pass through itl for any givenpressure in thel Water receptacle 20 and thus serves to provide a correspondingly large volume in thetube 2l relatively tothe volume of Water delivered to the tube for thepi'oduction andaccommodation of steamin the tube.l The perforated disks .22d also serve to equalize the Water flow from the Water receptacle `2Q to the tubes 2l, especially in starting the boiler, since these disks at once by limiting the flow of the ivater,- serve to establish a back pressure inthe vvater receptacle and thus to cause a practically uniform floWvof Water It has been found, hotvevei', that While it is desirable to use a restricted opening as provided by these disks at vthe ends of 4the tubes 21 connected to the Water' receptacle, that such restricting disks ordiaphragms are. not absolutely necessary, since during the o-pera-v tion of the boiler the pressure generated in each tube will automatically control the amount of Water supplied vto the tube and the resultant. operation of all ofthe tubes is to equalize the amount of Water supplied to thev several tubes and to therefore equalize the amount of steam produced by the tubes.

'As' 'pointed out, however, the restricted openings referred to lia've a decidedvalue -in equalizing theV Water flow into the several tubes when the operation of the boiler is begun and they assist inthe eficie-'nt operatioiv of the boiler While it is'inuse. The

gradual introduotioncf the water into the.,- heating zone may also be accomplished by-,.

means of a construction shown. in Fig. 6.

In this 'ai-rangement the looped tubes '21e extending between the 'Waterv receptacle- 2O tically in, line, as inthe modifications de scribed above, but the loops adjacent to the water receptacle 20 are comparatively short and increase in length toward .the 'steam receptacle 24, as a result of which thefire is not afforded as great heatingsurface on' vthe' -loops -nea-r tlielvvater receptacle-as it is on the loops near the steam receptcle, and thus the Water is not introducedat once to the point of maximum heating but is gradually heatedandis thus more cer;

tain to approach 'the middle. portion ofthe tube before being converted into steam.

VThis operation may be further accomplished4 by means of the construction of the burner, as indicated in Figs. 6 and. 7. The burner used in this modication consists in several square tubes 24b'placed on edge .and eX- tending in a direction under the tubes V21el parallel with the planes of such tubes. The

tubesare supported on their corners, and` the upper corners are slotted, as indicated at 24C, such slots being closer together under the portion'of the tubes 2le connected to.

the steam receptacle than they are under the portion of the tubes connected to-the water receptacle, as a result of which the intensity of the lire is less under the latter portion of the tubes than what it is under the former portion of the tubes.

In the boiler and system of control, shown in Fig. 8, I have provided a main section of boiler-76 and an emergency sectio-n 7 7, each similar in its construction to the boiler shown and described in Figs. l to el inclusive. In this boiler arrangement thepipes 32, 33 and 37 -supply fuel from the fuel 'tank 65, to the main, the pilot and the thermally controlled section of the burner of the main section 7G of the boiler. T he pipes 32 and 33 are connected by` means of three-way valves 78 and 79 through pipes 80 and 81 with themain and pilot sections respectivelyv of the emergency section 77 of the boiler. The amount of fuel supplied through the pipes 32 and 37 is controlled by means of the mechanism 62 andthe valve 73 respectively, as described above, the controlling mechanism 62 being connected through the pipe GO with the steam header 24, as indicated. The pipe GO also connects with the controlling Vmechanism 6l for regulatine: the amount of water supplied through the pipe to the waterreceptacle 20, as above described. The pipe 66 is 4provided with a three-way valve/82 connected to the water receptacle .2O of the. main section 7 6 of the boiler and by means of pipe 83 to the waterl receptacle 20 of the emergency section 77 of the boiler. The emergency section 77 is provided'with a steam header 24d connected with the steam header 2-l and with the pipe 60 through a three-way valve 84. he emergency and mainsections of the boiler are preferably separated by Ian insulating partition 85.*/ Each ofA the'thr'ee.-

dicated in Fig 9 the tank 65 is in communi cation through the valve Glwith the' pipe 80. When the vane 782L is moved from the position indicated in Fig. 9 around to the` right a suilicient amount for its low-er edge to enter the opening kconnected with the valve 64 bythe pipe 32a, fuel is communicated by the pipe 32a to both of the pipes 32 and 80 and thusto theyburner's of they main and emergency sections of the boiler.

Further motion ofthe vane 78a serves to move the lower left hand edge-of the vane y beyond the opening connected with the pipe Locali-1e opening connected With the pipe 32, for which position communication with the pipe 80 is cut olf and the fuel supplied by the pipe 32a is delivered only to the pipe 32. By means of the 'relation described between the main and emergency sections of the boiler, the valves 78, 79, 82and 84: may be caused to no-rmally occupy a position such that communication with the pipes 80, 8,1, 83 and the steam header` 24d is cut off. Under conditions requiring the development-of an unusual amount of power by the boiler, the valves mentioned are `turned to a position such that each valve communicates with both of its delivery pipes, that is, that the fuel supplied by the'pipe 32a is delivered to both of the pipes 32 and 80; that the fuel supply through the/'valve 79 is delivered to both of the pipes 33 and 81; that the pipe 60 is' connected through the valve 84 with, both of the steam headers 24: and 24d and that the water headers 20 and 2Oa are both connected through the valve 82 with the pipe (56. F or this position of the valves an amount of steam is developed that is in excess of that normally contemplated in` the operation of the boiler, thus permitting a large percentage of overload when desired. A further function of the emergency section is` that by moving the valves referred to to a -position to cut off communication with the pipes 32, 33, the water header. 20l and the steam header 24e, the emergency section 77 may be used alone and is designed to be capable of supplying enough power to drive the engine or other' motor temporarily. A

-Thev arrangement of boilers described' .is particularly valuable for use on automobiles, since in the event of conditions arising that call for an abnormal amount of power, both sections ofthe boiler may be used together, and Vagain if for some reason defects develop in the main section of the boiler at such a time that it is desirable to run the automobile to return home or to a repair-shop, the emergency section may be used alone. Furthermore, by separating. the

two sections itl ispossible in the event of defects developing in someone of the tubes of the main sect-ion, to run a short time on the emergency section while the main sec tion is cooling, so that it may be inspected and if possible repaired on the'road. De- -fectsthat may arise in connection with any individual tube of either section may readily be overcome by removing the defective tube and inserting a new tube, since eXtra tubes may readily be carried forthis lBU of tubes employed, 'as a result of which a boiler of small vertical cross section and' relatively great length is produced. In this modification the burners are arranged under the right hand end of the tubes 2li, as shown in Fig. l0, at Which end such tubes are c.o;iiformed in longer loops than at the other. portion of the tubes. This is for the pur pose of--increasing the heating surface imf mediately over the burners. The tire aftergi passing from the burners is caused to pass horizontally' through the loops of the diie'rent tu-bes tou'ard'the Water receptacle'Q()` before it can pass out through the flue-V S6. In thisA Way the temperature of the "gases resulting'from the combustion decreases' as' 'they pass to the'ilevft, as shown in Fig:` l0,

through the loops of the t-u'bes Qlf andthe Water entering from the Water header iS therefore gradually introduced into the `,heating Zone and each loop is therefore caused to 'operate in' a relatively effective. manner. This construction of boiler is pai'- ticularly adapted for'use upon automobiles,

-the heat remaining in. the .gases resulting from the-combustion of the-fuel after pass- I ing through the tubes Q1, maybe in part utilized tozheatthe feed Water ybefore `it is supplied to thefwater receptacle 20. u

Attention is called to the fact that in any modification of my .boiler the heating tubes are so looped that the loopsof each tube lie in practically al vertical plane a-nd that the planes of the several tubes usedare substantially parallel.l Also, that the spacing of the tubes from each other is such'that the adjacent'tubes are `nearly in contact with each other. This arrangement serves to completely fill the space above the burner with heating .loops and to'thus effeetively utilize. the fire producedby the burner. I have found it -desirable to arrange the looped tubes Ain vertical' pla-nes, in order t-o prevent a free and uninterrupted flow of Water' from the Water. header to the steam header.' Such an arrangement would be undesirable, since in the early stages of the transformation of thev Water into steam, only a portion. ofthe Water is so transformed and the steam produced at this time is relatively Wet. As a result, a considerable amount of moisture must still be evaporated from the steam -to de- 4 to the steam receptacle.-

liver*v only steam that is dry and eiiicient lf the loops of the tubeswe'ie arranged in horizontal planes Without the use of vertical risers, the water `carried by the steaml in its Wet condition Iwould pass A withl'1-'coiiiparatire freedom through 'the remaining length of the heatmg tubes and there would vbe considerable 4:danger of delivering steam in="wet condition. By disposing the loops of the tubes eliminated, since any Water carried bythe Wet steam at yits initial' production isi and must 'be liftedagainst the'action of trapped bythe lower. portions of-theloops gravity to pass into succeeding-'loops `The Water, therefore, 'has 'a -tendency to remain.

in tlielower ends of the loops Where-it is" effectively 'acted vupon by fire from the burner. i'Tfn vthis Way I preventvfthe production and delivery to the steaiii'jreceptaclev My boilerfc'onstruction is p'arti'oiilarlyl yiiell and the 'unions may yeither be'lplugged4 or a neur tube'fmay be inserted, Either Iof these operations readily accomplished `and the plugging of the unions Vparticularly constif tutes a convenient means for' temporarily repairing the boiler7 in order that an auto-` mobileupon which` it may be "in use may reach'its destination.I VThe usevof copper tubes in this connection is also particularly 1 y as steel, might result in an explosioriunder similar circumstances, that would seriously disable some'- of the rest ofthe mechanism. vlfff' an explosion should occur .with my construction it can only be comparatively small. on account of the small'size of the tubes-'used and therefore 'the danger ofinjury`,1eitlier to the apparatus or tothe occupantsof an automobile 'or persons near theboiler when it. is in' operation, is reduced to aininiinum. While T Vhave shownl my invent-ion in the particular modifications shown 'and described above, I do not Wish tiollimit myself to these constructions, but desire to claim broadly any equivalents y thatfinay suggest themselves to thoseskilled inftliear-tf 'Whatl claim is-f..4 i y.

1. In a boiler, the combination ofa Wat-er supply connection, aj steam connection, and a plurality of Ilooped".tubes extending'be- 'tween such Water aridi-.steam connections, the

-advantageous inthat in the eventj'of diifid will yield-With little or no damage toot-her jparts of the boiler, AAWhereas, the use of other i stronger materials of greater hardness, such I i 7.5M in vertical planes, this dangerv is'entirely v the same plane in the shape of a figure -and similarly disposed loops overlapping each other and fused together at points ot' crossing.

2. In a boiler, the combination of a water receptacle, and a tube of small b/re connected therewith and bent into Avertically extending overlapping loops, such tube having sections of larger internal diameter as the distance -from the water receptacle increases.

3. In a boiler, the combination of a water receptacle,-and a tube of small bore connected therewith and bent into vertically extendin overlapping loops, such tube consisting oIa plurality of sections of different internal diameters, and diameters increasing for successive sections.

4; In a boiler, the combination of a water receptacle, and a plurality of tubes ot small bore connected therewith and extending to a separate steam receptacle and bent into vertically extending overlappingloops, one or more of such tubes consisting of a plurality of sectionsof different internal diameters.

VA5. In a boiler, the )combination of' a water supply connection, a steam connection, and

' a pluralityl of looped tubes extending in substantially vertical planes between such water and steam connections, the loops of each tube formed in the shape of a figure 8, and similar, loops overlapping: each other and fused together at points of crossing,

such loops increasing in capacity as the distance from the water connection increases.

6.' In a boiler, the combination-of a water` receptacle, a separate' steam receptacle, a plurality of parallel tubeszformed in vertically'extending overlapping loops from the water receptacle to the steam receptacle, the loops of each tube fused together at points of crossing, such tubes being removable and in-. sertible without disturbing the remaining tubes.

7. In a boiler, the combination 'of a' water receptacle, a separate steam receptacle, i a plurality of parallel tubes ytermed in overlapping loops extending ;trom the water receptacle to the steam receptacle, the loops ot-` each tube secured together at points of crossing, unionY connectors for connecting such tubes to such ,treceptaclem and heat. resist-lng walls 'inclosing 'such union connectors to protect the same from the v4fire under the tubes.

8. In a boiler, the combination of va water header, asteam header, a plurality of tubes ot comparatively small bore extending in vertical loops from the water header to the steam header, and restrict-ing diaphragms associated with the tubes at the water header tor equalizing the distribution of the water to such tubes.

9. Ina boiler., the combination of a water V header, a stean'i header, a plurality ezt-tubes of comparatively small bore bent into ver; tical overlapping loopsbetween the Water header and the steam header, and a casing surrounding such headers and' tubes, such headers and tubes togethei` removable from the casing without disconnection trom-each other.

l0. In a boiler, the combination' of a steam connection, a water connection, -two water headers connected with the water connection, two steam headers connected with the steam connection, a main set of tubes extending rom one of the'water hea-ders to one of the steam headers, a-n auxiliary set of `tubes extending from the other water header ito the other steam header, and valves for @operatively connecting either set of tubes as desired. l l1. In a boiler, the combination of aA steam icnnection, a water connection, two water lheaders' connected with the water` connection, two steam headers connected with the steam connection, a main set of looped tubes extending in substantially 'vertical planes connections and tubes, and valves tor op-V eratively connecting either or both of' such sets of tubes as desired.

l2. A water coil for a boiler, comprising v a tube of compara-tively small bore formed in overlapping loops sufficiently close to the plane orp the coil so that such coil atno pointis more than twice the thickness of the outside diameter of thetube.

, 13; In a boiler', the combination of awater header, a separate steam header at substantially the same levehas the water header, and a plurality of tubes of comparatively small bore extending between the water header and the steam header to afford a plurality of parallel passages for the tlow of Water from the supply connection to theI steam header, such tubes formed in loops to trap the water as it passes from the water header to the steam header after it has been partially converted into steam.

14. Ina boiler, the combination of a water header, a separate steam header at substantially the same level as the water header, anda plurality of tubes of comparatively small bore extending between the water header and the steam header to aitord a plurality of parallel passages for the new ont water from the supply connection to the steam header, such tubes formed in vertical loops to re quire pressure upon the water in the water header to 'torce the water through such loops.

l5. In a boiler, the combination of a water header, a separate steam header, and a plurality ottubes of comparatively small bore extending between the water header an" the steam header to aHoi-d a plurality of parallel passages for the HOW of Water fromthe supply connection. to the steam header, such tubes each formedV in vertical overlapping loops to prevent the flow of Waterfrom the.

water header to the steani header under the action ol grm'ltv.

16. In a boiler, the combination of ar-vater i header, a separa-te steam header', an'dfaJ plu- 10 rality of tubes extending from the Water In Witness whereof, l hereunto subscribe 15 Amy name this 11th day 0 ,June, A. D. 1909.

. WILLIAM H. WINSLOW. Witnesses: Y Y

ALBERT C. BELL,-

LEONARD lV. NOVANDER.

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