US711860A

US711860A - Steam-boiler.

Info

Publication number: US711860A
Application number: US10578402A
Authority: US
Inventors: Jeanne Hopkins; William Hopkins
Original assignee: IOWA IRON WORKS Co
Current assignee: IOWA IRON WORKS Co
Priority date: 1902-05-03
Filing date: 1902-05-03
Publication date: 1902-10-21
Anticipated expiration: 1919-10-21

Description

No, 7|I,86o. Patented oct. 2|, v1902.

w. HOPKINS, Decd. g

J. HDPKIHS. Executrix. STEAM BOILER.-

(Application led May 3, 1902.) (No Model.) 6 Sheets-Sheet I.

No. 7||,860. vPatented Oct. 2l, |902.

W. HOPKINS, Decd.

l. HOPKINS. Executrix.

STEAM BOILEB.

Application med Magi 1902.) (No Model.) QQ 6 Sheets-Sheet 3.

No. 711,860. l Patented oct. 2|, |902; W. HOPKINS, Deod'.

J. HCIPKINS` Executrix. STEAM BUILER.

. (Applictionled May 3, 1902.) (No Model.) v 6 Sheets-Sheet 5.

m: Nonms Pains co. Pumaumo.. WASHINGTON, D. c.

N0. 7||,860. Patented Oct. 2|, |902.v

w. HoPKms, new.

1 HOPKINS Executrlx STEAM BulLEn. (Application med may s, 1902.

' 6 Sheets-Sheet 6.

(No Model.)

` ATTOHN 8.

WITNESSES.'

UNITED STATESV PATENT OFFICE.

JEANNE HOPKINS, OF DUBUQUE, IOWA, EXEOUTRIX OF WILLIAM HOPKINS, DEOEASED, ASSIGNOR TO IOWA IRON WORKS COMPANY, OF DUBUQUE,

IOWA. Y

STEAlVl-B'OILER.V

SPECIFICATION forming part of Letters Patent No. 71 1,860, dated October 21, 1902.

Application filed May 3, 1902. Serial No. 105.784- (No model.)

To al?, whom it may concern,.-

Be it known thatI, JEANNE HOPKINS, a citizen of the United States, and a resident of Dubuque, in the countyof Dubuque and State of Iowa, executrix of the estate of WILLIAM HOPKINS, deceased, (late a citizen of the United States, and a resident of Dubuque, in the county of Dubuque and State of Iowa, as by reference to the duly-certified copy of letro ters testamentary hereto annexed will more fully appear,) who did in his lifetime invent certain new and useful Improvements in Steam-Boilers, do hereby declare the following to be a full, clear, and exact description I5 of said invention.

This invention relates to improvements in steam-boilers which may be embodied in that type commonly known as marine boilers; but it is to be understood that the improvezo ments can also be used in many other kinds of boilers.

The object of the present invention is to combine water-circulating devices with a tubular boilervin such a manner as to attain rapid circulation of the water through practically all parts of the structure, an almost perfect combustion of the fuel and the resulting gaseous products of combustion, and rapid generation of steam. l

In devising the present construction the natural laws of the upward tendency of heat and the downward movement of cold were borne in mind, and the improved boiler about to be described makes provision for directing the heat and products of combustion in an upward direction and in a path longitudinally of the structure, so as to utilize the heat to the best advantage, and at the same time the cold or partially-heated Water is allowed to 4o circulate in a downward direction at one part of the boiler, then to move lengthwise of the boiler and in the path of the hottest part of the heat and flame, and then in an upward and backward direction, thus bringing thin layers or strata of water in the path of the circulating products of combustion, so as to quickly heat the water and generate steam.

The tubular element or member of the boiler is equipped with fire-tubes, and it is arranged 5o in such relation to the grate-chamber and the longitudinal boiler-fine that the shell of said tubular member is protected or isolated from the direct application or influence of the heat. This tubular memberis operatively connected with water legs or boxes, which are disposed at the opposite ends of the grate-chamber and the boiler-line, and these water legs or boxes are joined by an intermediate Water connection which arches the grate-chamber and the longitudinal line, so as to afford the desired protection to the shell of the tubular member and to allow the desired circulation of the Water in a thin layer or stratum and length- Wise of the flue, the circulation of the Water through this part of the boiler being facilitated by its rapid heating and the Water serving' to carry with it any sediment. The sediment cannot become deposited in the circulating-water channels of the boiler adjacent to thelongitudinal flue, because the water carries the sediment with it; but as the water contained in the tubular member. is heated to the proper point and does not circulate so rapidly as in the parts adjacent to the flue the sediment will accumulate in the tubular member, from whence it can be easily rcmoved.

Another advantage of the improved construction is that the distribution of heat and circulation of water is uniformly secured, so as to overcome any undue contraction or eX- pansion of the several parts.

It is well known that the parts of a boiler exposed both. to accumulation of sediment and the direct application of heat are liable to deteriorate or burn out quite early in the service of the'structure; but in the present invention these conditions do not obtain, because the sediment cannot collect in the parts exposed to the direct application of heat.

The invention further consists of asteamboiler embodying novel features of construction and arrangement of parts, which will be hereinafter fully described, andthe actual scope of the invention will be defined by the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the gures.

IOO

Figure 1 is a longitudinal sectional elevation through1 a steam-boiler embodying the present invention, the plane of the section being indicated by the dotted line l 1 of Fig. 2. Fig. 2 is an end elevation of the improved boiler looking at the front portion thereof. Fig. 3 is a detached detail View of the front line-sheet removed from the boiler. Fig. 4 is a transverse section in the Io plane of the dotted line 4 4 of Fig. 3. Fig.

5 is a detached front view of the rear lluesheet removed from the boiler. Fig. 6 is a vertical section through said rear flue-sheet in the plane of the dotted line 6 6 of Fig. l5 5. Fig. 7 is a detached View in front elevation of the front throat-sheet. Fig. 8 is a transverse section in the plane of the dotted line 3 8 of Fig. 7. Figs. 9 and 10 are views in front elevation and in transverse section, 2o respectively, of the rear throat-sheet, the

plane of the section in Fig. 10 being indicated by the dottedline 10 10 of Fig. 9. Fig.

11 is a vertical longitudinal section through another embodiment of the invention, the plane of the sectionvbeing indicated by the -dotted line 11 11 of Fig. 12. Fig. 12 isafront elevation of the boiler shown by Fig. 11,l and Fig. 13 is a transverse section in the plane of the dotted line 13 13 of Fig. 11.

A designates the tubular member or element of the improved steam-boiler.

B is the bridge-wall.

Cis the grate; D, the grate-chamber; E, the longitudinal flue, and F the return or 3 5 back connect-ion chamber.

The tubular member A of the boiler consists, primarily, of the cylindrical shell 5, the front and rear fine-sheets 6 7, and a plurality of {ire-tubes 8, the latter being disposed in 4o any suitable order within the shell 5 and united by approved means to the front and rear tine-sheets 6 7, respectively. The nests or groups of fire-tubes are arranged within the cylindrical shell so as to form or leave therein a steam-space 9, and the upper part of this shell is adapted to receive the hori zontal length of the feed-water pipe 10, the

off-bearing steam-pipe 11, and a number of longitudinal stay bolts or rods 12; but as 5o these last-described features are ordinary in the art it is not considered necessary to more particularly describe them.

In the improved boiler the flue-sheets 6 7 are constructed in a peculiar manner to form in part the water-legs at the front and rear ends of the boiler, and in Figs. 3, 4, 5, and 6 the improved 'flue-sheets are shown in detail.

Referring toFigs. 3 and 4, the front flue-sheet 6 is provided at its lower part With the exten- So sions 13 13a, which are disposed at the sides of the sheet, the latter being cut out, as represented more clearly by Fig. 3, in order to produce these extensions. The marginal or boundary edge of the Vfine-sheet is bent to i5 provide a rearwardly-extending flange 14, and

. the inner edge of the .extensions 13 13a and the bottom edge of the sheet are also bent in order to form another rearwardly-extending flange 15. Said. flue-sheet 6 is constructed with a plurality of tube-openings 16 in addition to the small openings 17 for the staybolts. This front fine-sheet is formed with a continuous series of comparatively large openings 1S, the latter being arranged in the extensions 13 13a and in the major portion of the flue-sheet just above the lower rearwardly-extending ange 15. These holes 1S in the complete boiler are adapted to serve as hand-holes for cleaning out the sediment which may accumulate in Jthe front leg or water-box, and said holes are normally closed by means of suitable heads or, caps, (indicated at 19 in Fig. 2.) The marginal ange 14 of the front lue-sheetis united to the front end of the shell 5, forming a part of the tubular member, and the rearwardly-extending flange 15 of this iue-sheetvis disposed below said tubular-member shell 5, so that it will occupy a coincident relation to a forwardlyextending flange on a front throat-sheet 20.

The throat-sheet 2O is disposedwithin the boiler so as to occupy an intermediate position between the grate-chamber D and the lower part of the front line-sheet 6, and this front throat-sheet is provided in its upper edge with a curved recess or cut-out portion 2l, while at its lower part the throat-sheet is formed with the extensions 22 22a. (See Fig. 7.) The recess or cut-out portion 21 of the front throat-sheet is curved on a radius corresponding to the external form of the shell 5, and this curved recess is provided with a rearwardly-extending flange 21f. (See Fig. 8.) The upper part of the front throat-sheet 20 is thus fashioned to form a saddle adapted to receive the front part of the boiler-shell 5, and this throat-sheet is united rmly to said shell 5 by riveting the parts together in a wellknown way. The lower part of the throatsheet 2O is cut out so as to produce the eX- tensions 22 22, which are provided with the forwardly-extending flange 23, and this liange 23 of the throat-sheet 20 occupies a coincident or abutting relation to the rearwardlyextending iiange 15 of the front flue-sheet 6, such coincident `relation 0E the two anges being represented more clearly by Fig. 1. The front throat-sheet aud the front fluesheet are joined together in a substantial way by means of an embracing-strap 24, which occupies a lapping relation to the iianges 15 23, as shown by Fig. 1, and which strap is united firmly to the parts by rivets or any other suitable means.

The union of the front Hue-sheet 6 and the front throat-sheet 2O provides a Water leg or box Gr at the front part of the boiler, and this Water-leg is in direct communication with the lfront part ot' the tubular member A, thus making provision for the downward circulation of the cold water, which is adapted to be supplied by the feed-pipe 10 to the front end of the boiler, as shown by Fig. 1. The front throat-sheet 2O is provided with a continuous TOO IIO

series of tube-openings 25, the same extending along the extensions 22 22 and across the forwardly-extending flan ge 23, as shown more clearly by Figs. 7 and 8. openings 25 will presently appear.

The front of the boiler is equipped with the usual fire-doors a andthe ash-pit doors b, and these fire-doors have suitable fittings ct,fwhich extend through the water leg or box G, so as to allow access to be obtained to the gratechamber D. The ash-pit doors b provide access to the ash-pit c, as usual. The grate C is properly supported at one end in front of the boiler and at the'oth'er end by the bridge- Wall B, the latter being built of fire-brick or other suitable material.

A back Water leg or-box H is provided at the rear part of the boiler by a construction analogous to the parts forming the front water leger box G, and in Figs. 5, 6, 9, and- 10 are shown the detail construction of the rear flue-sheet 7 and the rear throat-sheet 26. The rear flue-sheet 7- is provided with a plurality of tube-openings 27, in which are expanded the rear ends of the fire-tubes 8, and this flue-sheet is formed at its lower part with the large opening or slot 28, the latter providing the extensions 29 29u at the sides of said sheet, these extensions in this instance being joined together by the integral bridge portion 30 at the lower part of the sheet. The iiue-sheet 7i is formed with a marginal iange 3l, and this fine-sheet is riveted to the shell 5, and the edges surrounding the opening or slot 2S are bent so as to form the forwardly-extending flange 32.

The rear throat-sheet 26 is formed with a recess 33, which conforms to the radius of the shell 5, and this recessed edge is bent to provide a forwardly-extending ange 34, the latter adapted to serve as a seat or saddle for the rear part of the boiler. The throat-sheet 26 is provided with a slot or opening 35, the edges of which are bent to produce a rearwardly-extending ange 36,and, furthermore,

the throat-sheet is formed or provided with.

the stay-bolt openings 37 and with the tubeopenings 38, the latter extending around three sides of the slot 35. The rear throatsheet 26 is placed in the boiler-setting so as to lie near the rear extremity of the longitudinal flue E, andthis throat-sheet receives in its flanged recess 33 34 the rear part of the shell. The throat-sheet is placed in such` relation to the flue-sheet 7 that the slot 35 of the throat-sheet Will occupy coincident relation to the slot or opening 28 of said rear Hue-sheet. This disposition of the throat and flue sheets 26 7 will bring the

flanges

36 and 23 into coincident or abutting relation, and the union between these iianged portions of the flue-sheet and the throat-sheet is made water-tight by the employment of the strap (not shown) and which is similar to the strap 24. The water leg or box H thus formed at the rear part of the boiler is in direct communication with the water-space of the tubular member The utility of these products of combustion.

A, so as to allow of the heated Water and the steam passing 1'.. 'an' upward direction from this water-leg H into the tubular member A. Furthermore, the water leg or box H'provides the outlet for the heat and escaping products of combustion from the flue E into the back connection chamber F, because the passage provided by the openings 28 35 in the iiuesheet and the throat-sheet, respectively, establish the communication between the flue E and the chamber F, such heat-tine being surrounded by the water-box H.

One of the important features of the present invention is a water connection extending longitudinally of the flue E and the gratechamber D, said water connection serving to unite the frontand rear water legs'or boxes G H and affording means for the maintenance of water in thin strata, layers, or columns adjacent to or in the direct path of the escaping In one embodiment of the invention this Water connection is attained by a plurality of tubes or pipes 39, which are necessarily disposed in an inclined direction longitudinally of the boiler. The front ends of these tubes 39 are united to the front throat-sheet 20 by any approved means, preferably by vexpanding said tubes in the tube-openings 25, While the rear ends of said tubes 39 are united in an approved way to the rear throat-sheet 26, preferably by expanding said tubes 39 in the tube-openings 38 thereof. These tubes 39 have direct comthe ue.

The arrangement of the circulating-tubes 39 in positions exposed to the direct action of the escaping products of combustion and the inclination of these tubes longitudinally of the boiler facilitates the circulation of the water through the tubes and from the front water-leg G toward the rear water-leg H, whereby the circulating Water is adapted to carry with it any sediment which may be present in the 4water7 thus overcoming all tendency of the sediment to accumulate in the circulatingtubes. The water circulating through the tubes 39 and the legs is adapted to carry with it the sediment Wh ich is caused to lodge or accumulate in the shell 5 of the tubular member, from whence the sediment can be removed more easily than from anyother part of the boiler. It therefore becomes necessary to protect the shell 5 from the direct action of the escaping products of combustion, and this end is IOO "munication at their front ends with the front IIO.

and outside of the vertically-disposed tubes at the sides of the boiler. This Hue-crown extends over the grate-chamber and the longitudinal flue, and said flue-crown preferably consists of the series of fire-tiles 40, a protection layer 41 of asbestos or other non-heatconducting material, and a metallic sheet 42, the whole being compactly disposed across the lowerpart of the shell 5 and over the group of circulating water-tubes 39. It is evident that the heat will not radiate freely through this rounded flue-crown, and thus the under side of the boiler-shell 5 will not be exposed to the direct action of the heat. The back connection-chamber F lies at the rear of the boiler, so as to have communication with the iiue E through the slots and openings 28 35 in the sheets 7 26, respectively, and the upper part of this chamber F is disposed in a manner to deliver the heatand products of combustion in the lire-tubes 8, the latter serving to conduct the heat and gases through the Water contained in the chamber of the shell 5, whereby the Waste heat and gases will be discharged at the front end of the boiler and into the stack or up-take.

The flue-sheet 6 and the throat-sheet 20 are reinforced by the employment of suitable stay-bolts 43, and the liuc-sheet 6 and the shell 5 are also strengthened by the employment of the stays 44. (See Fig. l.) The rear flue-sheet 7 and the rear throat-sheet 26 should be similarly reinforced by stay-bolts adapted to be secured in the openings 37 of the throatsheet and similar openings 37:, which are provided in the rear line-sheet '7.

In the boiler shown by Figs. 11 to 13, inclusive, the tubular member A is constructed as hereinbefore described and is equipped with the tubes 0r stays and the ordinary pipes. The front and rear Hue-sheets are substantially the same as in the boiler shown by Fig. 1, while the front and rear throatsheets are modified somewhat in order to receive the parts forming the modified type of longitudinal water connection between the front and rear water legs or boxes Gr I-I. The throat-sheet 45 at the front is provided with a rearwardly-extending flange 46, while the rear throat-sheet 47 has a forwardly-extending iiange 48. To these flanges of the front and rear throat-sheets are united the end portions of an arched shell 49, within which arched shell is disposed the crown-sheet 50, the latter occupying a parallel or concentric relation throughout its length to the arched shell 49. The end portions of the crownsheet 50 have overlapping relation to the inwardly-extending

iianges

15 and 32 of the front and rear iiue-sheets 6 7, respectively, and this crown-sheet is bolted or riveted rmly to said flanges of the flue-sheets. The crown-sheet thus extends from end to end of the boiler, so as to occupy an arching and inclosingrelation at the sides of the grate-charnber D and the longitudinal iiue E, whereby the crown-sheet is exposed throughout its length and width to the direct action of heat and products of combustion. The crownsheet 50 and thc arched shell 49 are united together by the stay-bolts 51,anydesired number of which may be employed in any desired order or relation, and said parts 49 50 provide a water jacket vor chamber 52, which has direct communication at its end portions with the legs G H, such chamber serving to maintain a thin stratum or layer of Water adjacent to the path of the escaping products of combustion. The crown-sheet 50 and the surrounding water-chamber 52, formed by said crown-sheet and the shell 49, occupy a rearwardly and upwardly inclined position from the front water-leg to the rear water-leg, and this arrangement of Athe parts facilitates the circulation of the products of combustion and of the hot water and steam contained in the chamber. The products of combustion in this type of boiler pass from the Hue E through the rear water-leg H into the back connection-chamber F, from whence they pass in an upward direction into the fire-tubes 8 of the boiler member A. It is preferred to employ the stays 53 between the crown-sheet 50 and the front flue-sheet G, as shown by Fig. 11. The surrounding water-chamber 52, which forms the circulating connection between the front and rear water-legs, affords the desired protection to the under side of the shell 5, so as to prevent the escaping heat and products of combustion` from having direct access to this shell, and in this respect the chamber 52 is the equivalent for the group of circulatingpipes 39 and the arched Hue-crown I.

In the service of the boiler the gases and products of combustiony pass from the gratechamber D into and through the flue E, and thence the products of combustion pass th rough the back water-leg H into and through the back connection-chamber F, from whence they pass through the lire-tubes 8 of the tubular member A. The gases and smoke which traverse the flue E pass in an upward and rearward direction, because the iiue is inclined to facilitate theescape of the products of combustion, and the parts surrounding this flue, as well as the combustion-chamber F, are adapted to be heated, so that proper combustion of the smoke and gases will be obtained after the boiler shall have been started. The comparatively cool feed-water i`s supplied by the pipe 10 at the front end of the boiler, so that it will pass into the waterleg G and from thence iiow in a backward and upward direction through the tubes 39 or the chamber 52. rllhe cold water being supplied rby the front water-leg to the tubes or chamber,it is evident that the water in passing through the tubes will be heated quickly by the gases and products of combustion, and as this heated water has a natural tendency to rise the inclination of the tubes 39 or the chamber 52 facilitates the circulation of the water. After passing through the tubes or the chamber the water iiows into the back IIO leg H and from thence in an upward direction into the tubular member A, through which the water flows toward the front, whereby the water is adapted to circulate continuously from the front toward the rear in the lower part of the structure and from the rear toward the front in the upper part of the structure. This circulation of the water and the inclination of the tubes or the chamber prevents the lodgment of the sediment in the circulating connections at the lower part of the boiler, and the sediment is thus carried into the tubular member A, in which the sediment is free to accumulate, as hereinbefore described.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is-

l. A steam-boiler substantially such as described, comprising a tubular member having smoke-fines, a grate-chamber, a flue in communication with said tubular member and the grate-chamber, front and rear waterlegs in communication with the tubular member, and a water connection arching the 'grate-chamber and the iiue and in communication with the front and rear Water-legs.

2. A steam-boiler substantially such as described, comprising a tubular member provided with smoke-dues, front and rear waterlegs having direct communication with the water-space of said tubular member, a gratechamber, a longitudinal iiue, a back connection between said iiue and the smoke-fines, and a water connection in communication with said legs and extending longitudinally of the grate-chamber and said longitudinal flue, said water connection lying between the tubular member and the longitudinal iiue.

3. A steam-boiler substantially such as described, comprising an upper member having smoke-dues, a grate-chamber, a longitudinalv flue in communication with said grate-chamber, a back connection between the longitudinal iiue and the smoke-fines ot the upper member, a water-leg connected to the waterspace of the upper member at the frontend thereof, another water-leg connected to the water-space at the rear end of said upper member and disposed in the path of the products of combustion as they pass from saidtlue into the upper member, and a water connection in communication with the front and rear legs and extending along the gratechamber and said iiue, said Water connection being interposed between the upper member and the connected grate-chamber and due.

4. A steam-boiler substantially such as described, comprising a tubular member having smoke-dues, a grate-chamber, a connectingfine between the grate-chamber and the tubular member, front and rear water-legs in communication with end portions of said tubular member, and an inclined water connection extending below the tubular member and arching the grate-chamber and the iiue and communicating with said water-legs.

5. A steam-boiler substantially such as described, comprising a tubular member having smoke-fines, a grate-chamber, a back connection in communication with the smoke-dues, a flue between said grate-chamber and the back connection, front and rear water-legs in communication with the water-space at end portions of said tubular member, and an intermediate water connection in communication with said water-legs, said intermediate connection beinginclined between said waterlegs and arching the grate-chamber and said iiue.

6. A steam-boiler substantially such as described, comprising a tubular member having smoke-fines, a grate-chamber, a back connection in communication with said smoke-fines, a longitudinal tlue connecting the grate-chamber and the back connection, front and rear Water-legs in direct communication with the Water-space of said tubular member, and an intermediate water' connection in communication with said water-legs and disposed between the tubular member and said gratechamber to afford protection to the tubular member against direct action of escaping products of combustion.

7. In a steam-boiler substantially such as described, a tubular member having a front flue-sheet provided with integral depending extensions, afront throat-sheet having similar downwardly-extending portions and united to the front flue-sheet to form an intermediate water leg or chamber, and a series of smokeiin es within the tubular member and attached to the front iiue-sheet, combined with a rear IOO water-leg, and an intermediate water connection between the two water-legs.

8. In a steam-boiler substantially such as described, a tubular member having a front flue-sheet which is extended below the shell of said member and is cut away to form the integral depending extensions, a front throatsheet disposed in parallel'relation to the tube- IIO sheet and united therewith to form an inter- Y mediate water leg or box at the front ot the boiler, and a series of smoke-fines disposed in the tubular member and attached to the front flue-sheet, combined with a rear waterbox, and an intermediate connection between the two water boxes or legs.

9. In a steam-boiler substantially such as described, a tubular member provided with a front flue-sheet having integral depending extensions, said flue-sheet having a series of hand-holes in the lower part thereof and in said extensions, a front throat-sheet disposed in cooperative relation and'united to said tluesheet to form an intermediate water leg or box at the front of the boiler, and a series ot' smoke-fines disposed in the tubular member and attached to the front tine-sheet, combined with a rear Water leg or box, and an intermediate connection between the front and rear water-legs.

10. In a steam-boiler substantially such as described, a tubular member having its front IZO lue-sheet-extendedbelow the shell of said member, av front throat-sheet formed With a recess whichconstitutes a saddle for the reception of said tubular member, said front throat-sheet being united to the front linesheet and formingtherewith a water leg or box at the front of the boiler, and smoke-lines disposed in the tubular member and attached to said front flue-sheet, combined with a rear water leg or box, and an intermediate water connection between the two water-legs.

11. In a steam-boiler substantially such as described, a tubular member provided with a rear due-sheet having integral depending extensions, a rear throat-sheet provided with like extensions and disposed in coperative relation to said rear sheet to form a water leg or box at the rear of the boiler, and smokeilues disposed in the tubular member and aitached to said flue-sheet, in combination with a front leg or box, and a water connection intermediate of said water-legs.

12. In a steam-boiler substantially such as described, a tubular member having a rear flue-sheet provided with integral depending portions and with a lianged slot or opening,

v a rear throat-sheet in cooperative relation to said due-sheet to form an intermediate Waterleg, and likewise havinga flanged slot or opening which forms with the slot of the flue-sheet a passagefor escaping products of combustion, and smoke-fines attached to the rear flue-sheet, combined with a front Water-box, and an intermediate water connection.

, 13. In a steam-boiler substantially such as described, a tubular member having its rear flue-sheet provided with integral depending portions, a throat-sheet disposed in coperative relation to the liuc-sheet to form therewith a water leg or box, said throat-sheet having a saddle which receives said tubular member, and smoke-dues in the tubular member and attached to the rear flue-sheet, combined with a front water-leg and an intermediate water connection.

14. In a steam-boiler substantially such as described, the combination of a tubular member having smoke-fines and provided with depending Water-legs atits front and rear portions, the rear water-leg being provided with a transverse slot for the passage of products of combustion, a grate-chamber, a flue communicating with said slot of the rear waterleg, and a series of water-tubes in communication with said water-legs and arching the grate-chamber and the flue.

15. In a steam-boiler substantially such as described, the combination of a tubular member having smoke-dues and provided with water-legs at its front and rear portions, said rear water-leg having a transverse smokepassage, a grate-chamber, a flue communieating with said smoke-passage of the rear water-leg, a water connection between said water-legs, and an arched flue-crown between the water connection and said tubular member.

16. In a steam-boiler substantially such as described, the combination of a tubular member having smoke-lines and provided with water-legs at its front and rear portions, a grate-chamber, a flue, a backv connection between said ilue and the smoke-fines of the tubular member, a Water connection between said water-legs, and an arched flue-crown interposed between the connection and the tubular member,said flue-crown having afacing composed of tire-tile and a heat-resisting lining forming a backing for said fire-tile.

17. In a steam-boiler substantially such as described, the combinationof a tubular member having lsmoke-dues and provided with waterdegs at its end portions, a grate-chamber, a flue, a back connection between the flue and said smoke-dues of the tubular member, a series of inclined water-tubes connecting said Water-legs, and a flue-crown disposed below the-tubular member and over said watertubes.

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

JEANNE HOPKINS, Eeeutrtx of the estate of William Hopkins,

deceased.

Witnesses:

RoB'r. BoNsoN, HENRY SCHROEDER.