US672251A - Boiler. - Google Patents

Description

. No. 672,25l. Patented Apr. la, mol.

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Bouin.

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f 672,25'- n Patented Apr. le, Ism.

A. wonnlmson.

BILER (Application led Jan. 8, 1901,) (N0 Models sheefs-sheet z.

No. 672,25l. Paten-reu Apr. le, |9011.

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BOILEB.

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Y trito States Faisant tribu.

AMASA VVORTHINGTON, OF BROOKLYN, NEY YORK.

BOILER.

SPEGIFGATION farming* part 0f Letters Patent NO. 672,251, dated April 16, 1901.

' Application filed January 8,'1901. Serial No. 42,494. (No model.)

To all whom it may concern:

Be it known that I, AMASA YORTHINGTON, a citizen of the United States, and a resident ofthe borough of Brooklyn, in the city of New York,count y of Kings, and State of New York, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specilication.

My invention relates to steam-boilers of the water-tube class, and especially to the form thereof that has the alternate sections of its water-tubes inclined in opposite directions, and is designed more particularly for marine use, while yet being capable of general application, its object being to provide a boiler of this character which while simple and compact in construction and efficient in operation shall at the same time dispense with the necessity for masonry settings and have certain of the side walls of its fire-box or furnace formed by the extension of portions of the boiler through which the water circulates.

To these ends the invention consists, lirst, in certain novel features of construction in the boiler itself; second, in the peculiarities of construction of the tire-box or furnace and in its combination with the parts of the boiler; third, in the means whereby access to the water tubes and headers is afforded to allow of the rernovalofdust and ashes from them when required, and, fourth, in various other coustruct/ions and combinations of parts, all as will hereinafter more fully appear.

Referring to the accompanying drawings, which form a part of this specification, Figure l is a vertical transverse section of a boiler constructed in accordance with my invention, taken in the plane 0c of Fig. 2; Fig. 2, a vertical longitudinal section of the same, taken in the line w w of Fig. l; Fig. 3, a similar vertical transverse section of a boiler likewise constructed in accordance with my invention, but of a slightly-modified form, taken in the plane e a of Fig. 4; Fig. 4, a vertical longitudinal section thereof, taken in the line y y of Fig. 3; Fig. 5, a front elevation of a boiler constructed in accordance with that shown iu Figs.` l and 2; Fig. 6, a similar front elevation of a boiler constructed in accordance with the forms shown in Fri-gs. 3 and 4; Fig. 7, a detail side elevation of a portion of two of the water-tubes and of one of their cooperating headers, with the latter shown in section; Fig. 8, Ia detail isometric projection of one of the hand-hole-closiug devices and a portion of the wall of the member in which itis secured, showing the manner of cutting and distorting the former when its removal is required; Fig. 9, a sectional edge view of one of the closing devices before being` expanded and a portion of the wall in which it is to be secured, taken axially of the former, with a side elevation, partly in section, of a mechanism by which the expanding of the closingA device may be effected; and Fig. lO, a top or plan view of the closing-device-expanding mechanism shown-in Fig. 9.

In all the figures like letters 'of reference are employed to designate corresponding parts.

A. and A indicate. the water-tubes, and B B B2 B3 the headers with which these tubes respectively coperate. These water-tubes are preferably disposed in a number of series, with the individual tubes of each series arranged the one above the other in a vertical row, and are secured at their opposite ends in their appropriate headers, which are preferably constructed of rectangular form in cross-section and provided with suitablyformed orifices in which these ends. enter.

The different series ot' water-tubes A, with their respective headers B and B', are inclined to the horizon in one direction and are alternatcd with the different series of the watertuloes Al, which, with their respective headers B2 and B3, are similarly inclined in the opposite direction. As thus disposed the various series of water-tubes `lie side by side in a horizontal direction throughout the extent of the boiler and constitute with their respective headers separate and independent sections O Ol O2, duc.

Located above the headers B and B;a are the respective steam and water drums D and D', which extend transversely over the various series of water-tubes A and A 4and are connected at different points along their lengths by tubes d and d', that extend across from one of the drums to the other and enter at their opposite ends suitable orices formed in their walls, with the tubes d preferably disposed above and the tubes d. below a horizontal line extending through their axes. To

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the steam and water drums thus located the respective headers B and B2 are connected by suitable nipples d3, which enter at their opposite ends suitable orifices formed in the latterand the walls of the former, as shown. Theheaders B and B2 being thus connected to their respective steam and water drums D and D', the headers B' and B3 are in like inanner connected with them; but instead of this connection being made with the drum immediately above them they are connected across to the opposite drums, for which purpose the tubes d4 are employed, which, entering at one of their ends suitably-formed orifices in their respective headers, extend across to the opposite steam and water drums and enter at their opposite ends suitable orifices formed in them. By thus connecting the under headers B' and B8 as well as the upper headers B and B2' with their respective steam and water drums D and D' and similarly connecting these latter by appropriate tubes not only is the free and uninterrupted circulation of the water through the various series of water-tubes A and A' and the steam and water drums permitted, but the flow of this Water is facilitated by the inclination of these water-tubes with respect to the horizon, as before explained. While the upper ends of the headers B' and B3 are thus connected with the steam and water drums D and D', their lower ends are similarly connected with their respective muddrnnns E and E', and to permit ot' this being accomplished theyare severally provided with downwardly extending portions through which this connection is effected. In some instances these downwardly-extending portions, in addition to serving as a means for connecting their appropriate headers to the mud-drums, likewise serve to form a portion of the vertical walls of the fire-box F and ashpit F', as shown in Figs. l and 2, while in other instances they will form a portion of the vertical walls of the fire-box alone, as shown in Figs. 3 and 4. When availed of to form a portion of the vertical walls of the fire-box and ash-pit, and the doors fand j" of the tirebox and ash-pit are located at one end of the boiler, as shown, for instance, in Figs. l and 2, then these downwardly-extending portions of both of the series of headers B' and B3 will be extended downwardly past both the firebox and ash-pit and will rest at their lower ends either upon the floor or foundation of the boiler or upon their coperating muddrums E and E', which in these cases will similarly rest thereon. So, too, when employed to form la portion of the vertical walls of the tire-box alone, and thefloors of the firebox and ash-pit are similarly located at the end of the boiler, then the downwardly-extending portions of these headers will be extended downward past the fire-box; but instead of being extended downward past the ash-pit and resting at their lower ends either upon the floor or foundation of the boiler or upon their respective mud-drums that rest thereon these ends will rest either upon a stand or support H, in which the ash-pit is formed, or ,upon their respective mnd-drums, which will likewise rest upon it. On the other hand, when their downwardly-extending portions are employed to form a portion of the vertical walls of the fire-box and ashpit and the doors for the fire-box or ash-pit are located at one side of the boiler, as shown in Figs. 3 and 4t, then only the downwardlyextending portions of the headers B3 and such of the downwardly-extending portions of the headers B' as are situate on opposite sides of the doors will be extended downward past both the fire-box and the ash-pit and such of the downwardly-extending portions of these latter headers as are in line-With these doors will be extended downward only to the top of the upper one,f. The same is likewise true when the downwardly-extending portions of these headers are vemployed to form aportion of the vertical walls of the fire-box alone and the doorsfandf of the tire-box and ash-pit are similarly located at the side of the boiler and only the downwardly-extending portions of the headers B3 and such of the downwardly-extending portions of the headers B' as are on opposite sides of the doors will be extended downward past the fire-box and those of such downwardly-extending por-tions of these latter headers as are in line with the doors will be extended downwardly only to the top of the door-fof the fire-box, as shown.

When the downwardly-extending portions of the headers B' and B3 rest at their lower ends upon the flooror foundation of the boiler, the mud-drn ms' E and E', which are or may be constructed of rectangular form in crosssectlon, will be preferably arranged outside of the downwardly-extending portions of their respective headers, as shown in Figs. l and 2, and be connected with them through the intervention of nipples b, which enter at their opposite ends suitable orifices formed in the sides ot' the former and latter, respectively. On the other hand, when these downwardlyextending portions rest at their lower ends upon the mud-drums, as shown in Figs. 3 and 4, then instead of these drums being connected with their sides they are connected with their lower ends and the nipples b enter at their opposite ends suitable orifices formed in the upper sides of the mud-drums and the lower ends of' the extending portions of their respective headers B" and B3. While thus the lower ends of such of the downwardlyextending portions of the headers B and B3 as extend downwardly past the fire-box and ash-pit in one case and past the firebox in the other are connected with their respective mud-drums, the lower ends of such of these downwardly-extending portions as extend downwardly only to thetop of the door to the fire-box arev likewise connected and bound together by a tube I. This tube, which is preferably constructed of rectangular form IOO IZO

in cross-section and with closed ends, is made of a length to extend not only across the lower ends of such of these downwardly-extending portions as are terminated at the top of the fire-box door, but also across the downwardlyextending portion that is located on each side thereof and is connected with both the former and latter through the medium of nipples b2, which enter at their opposite ends suitable orifices formed in the front and rear faces of the tube and each of the extending portions, respectively.

In those instances where the doors of the tire-box and ash-pit are located at the ends of the boiler all the water-tubes A and A' will preferably be secured at their opposite ends in their respective headers. On the other hand, in those instances where the doors to the fire-box and ash-pit are located on the side of the boiler, as in Figs. 3 and 4, then instead of securing the opposite ends of all the water-tubes in their appropriate headers the ends of such of these water-tubes as lie directly above those doors and adjacent thereto are preferably secured in the tube I. As thus connected, the free circulation of water through these several headers is insured,while through the connection of the remaining headers with their respective mud drums the farther circulation of water through them is likewise permitted, and any mud or other sediment separated out from the water will settle in the latter, from which it may be discharged through appropriate pipes and valves, as shown, for instance, at O and o, respectively, in Figs. 4 and 6.

The stand or support H when employed to bottom edges with the laterally-extending lon.

gitudinal flanges h' and h2 and are connected at their ends and held at the proper distance apart by the plate-like girths h3, that extend across between them and are secured at their opposite ends by suitable bolts or screws h4 to appropriate iianges h5, wit-h which these sides are provided. As thus constructed the stand or support is adapted to rest with its open bottom upon the licor or other foundation provided to receive it and not only sustain the boiler, which will rest upon its open top, but also afford within itself an ash-pit therefor.

With the boiler constructed either to rest directly upon thetloor or other foundation prepared to receive it or upon a stand or support H the fire-box F is separated from the ash-pit F by the grate-bars F2, which in the former construction rests at their4 opposite ends upon suitable `girders i, that in turn are supported at their opposite ends upon brackets t", which are secured to the'inner faces of the downwardly-extending portions of cer-` tain of the respect-ive headers B and B3, as shown in Figs. l and 2, while in the latter construction the opposite ends of these gratebars are supported upon in wardly-extending flanges i2, formed on the inner side of the stand or support H, as shown in Figs and 4.

In effecting the securement of the ends of the various tubes and nipples in the respective orifices in which they enter any of the ordinary and well-known expedients usually adopted for that purpose may be employed. I prefer, however, to accomplish that result by expanding the portion of the tube or nipple which enters the orifice until it completely.

tills the same and has its ownextremity made somewhat larger than the latter, as is now common to boilers of this class as at present constructed, and in order to provide for the expansion of these ends the various headers, tubes, and other members in which they are expanded, outside of the steam and water drums, are severally provided in the sides opposite to them with suitable hand-holes Z, through which access may be had to them for that purpose and which may be closed by any appropriate means, such as screw plugs or caps. In the form of the construction which has been selected for illustration these means consist of a cup-shaped stopper Z', which is preferably constructed of du'ctile sheet metal, with cylindrical side walls Z2, a spherical bottom Z3, and an outwardly-extending flange Z4 around its upper edge, as shown in the lower portion of Fig. 7. As thus constructed this stopper is inserted in the hand-hole to be closed and expanded therein until a bead Z5. is formed in it on the inside of the member in which it is employed, as shown at the top in such figure, forming therebya simple and efficient closing device for the hand-hole, which may be readily removed therefrom when desired by simply cutting through its bottom Z3 with a chisel or otherwise for a sufficient distance around its outer edge to permit of the part detached being forced inward, as shown in Fig. S, when the cylindrical side walls Z2 may be bent inward or distorted, as illustrated by the dot-ted lines in that gure, and the stopper then easily withdrawn from the hole in which it is inserted. For expanding the stopper thus described in a hand or other hole when it is desired to close the latter various means may be adopted. In Figs. 9 and l0, however, is shown a device which may be employed for .t that purpose, the same comprising a round body portion K, that is threaded upon a shaft K by appropriate threads Zt and is provided in its lower portion with a plurality of radially-disposed recesses or chambers le, in which are located cylindrical rolls 7a2, that cooperate with the conical lower portions k3 ot' such shaft and are held in their respective recesses or chambers Zt by a cap 7a4, that is secured to the lower end of the body 7c by appropriate screws los, as shown. As lthus con- IOS IIO

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structed when a stopper is to be expanded within a hand or other hole the lower end of the expanding device is inserted within it and the shaft rotated in the proper direction within the body K, the result of which will be that the conical lower portion k3 of such shaft will be drawn upward in rear of the rolls k2, forcing them outward.against the interior of the side walls of the stopper, while at the same time rotating those rolls, and thereby expanding the stopper within the hole, as more fully shown and described in the application for Letters Patent filed by me in the United States Patent Office June 13, 1900, Serial No. 20,406, to which reference may be had.

The boiler being constructed as above described may be inclosed within an ordinary brick or other masonry setting. It is preferred, however, to inclose it within a casing that is composed of plates which may be formed either from cement, magnesia, or firefelt properly treated and firmly packed and solidified in pan-shaped backs m, that are constructed of sheet metal with laterally-extending ribs and flanges m formed on their inner sides around their edges and elsewhere by securing angle-irons to them by rivets and otherwise, or some of the plates may be formed from those materials and the other from cast metal. As thus constructed from any one of the materials specified the plates may be made either of a size to cover the entire front, side,

back, or top of the boiler, or they may be made up from a number of constituent sections or panels and secured together as preferred; but in whichever of the Ways they may be thus constructed they will preferably be provided around the edges that are to be joined to others With appropriate flanges, which may be formed either by extending the back m beyond the lateral flanges m thereon, as shown at m2 in Fig. 6, or by securing angle-irons to their outer faces near their edges, as shown at m3 in Figs. 1 and 3, accordingly as the edges are to be lapped upon or abutted against the edges of others.

In Figs. 1, 2, and 5 is shown a casing in which the top, sides, and back are constructed of plates that are formed from cement, magnesia, or fire-felt, as above explained, and the front from plates that are formed from cast metal. In this construction the plates L, L', and L2, either as integral wholes or as made up from constituent sections or panels, will be made of the proper sizes and shapes to cover the respective top, sides, and back of` the boiler, including the steam and water drums D and D', and will be united at their adjoining edges by appropriate screws and bolts passing through their respective anges m2 and m3, as above explained. In like manner the plate for the front of the boiler will be made of the proper size and shape for that purpose; but instead of being constructed as an integral Whole it is preferably constructed in two sections L3 and L4, which are secured together by appropriate iianges and bolts m4 and m5. As thus constructed this plate is received within the front end of the casing and the projecting flanges 'm2 of the top and side plates L and L lapped over its top and side edges and secured to it by bolts m5, as shown. In Figs. 3, 4c,4 and 6, on the other hand, is shown a casing in which the top and sides are constructed of plates that are formed from cement, magnesia, or tire-felt and the portions answering to the front and back constructed of plates that are formed from castiron. In this construction, as in the former, the plates L and L', either as integral wholes or as made up from constituent sections or panels, are constructedl of the proper sizes and shapes to cover the respective top and sides of the boiler with the steam and water drums. The same is also true respecting the plates L5 and L6; but instead of these plates being made up from parts they are shown as constructed as integral wholes and are received within the opposite ends of the casings with the projecting iianges m2 on the ends of the top and side plates L and L lapped over their respective edges and secured thereto by bolts m5.

When the doors f and f of the respective lire-box and ash-pit are located in the end of the boiler and the boiler rests upon the floor or foundation prepared to receive it, the respective frames f2 and j3 for those doors will be secured in the plate L4, as shown in Figs. 1, 2, and 5. In like manner when these doors are located upon the side of the boiler and the boiler similarly rests upon the floor or foundation prepared for it the frames for these doors Will be secured in either of the side plates L that may be desired and in some instances may extend inward between and be secured to the downwardly-extending portions of the headers B' or B3, that may be disposed on opposite sides of them. On the other hand, when the boiler rests upon a stand or support the frame f2 for the door f of the lire-box will be located in either the plates L5 or L6, and the frame f4 for the door of the ash-pit will be formed in the stand or support H. So, too, when these doors are arranged upon the side of the boiler and the boiler similarly rests upon a stand or support the frame f2 for the door of the fire-box will be secured in either of the plates L and may likewise extend inward between and be secured to the downwardly-extending portion of the headers B or B3, that may be disposed on opposite sides of it, While the frame for the door f4 of the ash-pit will be formed in the stand or support H, as above explained.

With the frames for the doors disposedunder any of the arrangements specified the door f to the fire-box F will be preferably jointed to its respective frame by hinges f5 and will be provided with a suitable latch f6 IOO IIOv

for coperation with a catch f7. The door f to the ashpit F', on lthe other hand, instead of being' hinged to its respective frame will be provided with a suitable base and handle f8, whereby it may be set in front of the aperture through the door-frame and be held in that position or removed wholly therefrom when desired.

When the doors for the fire-box and ash-pit are located upon the side of the boiler, it is sometimes found desirable to protect the plates L5 at the ends of the boiler and prevent the escape of heat through them. To accomplish this, a lining of fire-brick F3 on the inside of each of the plates is employed, which, constructed in the form of a thin wall, extends the entire length of the fire-box and from the foundation of the boiler upward to the under side of the water-tubes A and A', as illustrated in Figs. 3 and 4. On the other hand, when these doors are disposed at the end of the boiler it is likewise found desirable to close the spaces between the lowest water-tubes A and A' from the front of the boiler toward its rear for approximately twothirds of its length by re-bricks F4 or other heat-resisting material, as well as the spaces between the tubes CZ* from the rear of the boiler forward for approximately the same distance by similar bricks or material F5;

whereby to form a sinuous iiue for the passage of the heat and other products of the combustion through the various series of water-tubes in their travel from the fire-box to the uptake M, which latter is preferably 1ocated in the top of the casing between the steam and water drums D and D', as shown in Figs. l and 2.

For removing the ashes and other refuse from the ash-pit the ash-pan N is employed, which is preferably constructed of a width to enter the-aperture in door-framefz, and in order to insure the ashes and other materials falling through lbetween the grate-bars F2 on opposite sides of this pan reaching it the deiiectors fgare employed, which, secured at their upper edges either to the inner faces of the downwardly-extended portion of the respective headers B' and B2 or to the interior of the stand or support H, incline inward and downward with their respective lower edges resting over such pan.

With a view to removing the ashes and soot from the tops of the water-tubes when the forms of boiler and casing shown in Figs. l and 5 are employed the orifices n are provided, which are so disposed in the plate L3 as to permit of a jet of steam or compressed air being introduced into the casing at the points where required by an appropriate nozzle. On the other hand, when the forms of boiler and setting shown in Figs. 3 and 6 are made use of, these orifices will be disposed in a row along the plate L' opposite the space between the upper and under headers, and in order to permit of their being closed when their use is not required, while yet allowing of their' being opened when the jet of steam or air is to be introduced the plate n is employed, which, fitted to slide longitudinally in suitable guideways n2, secured to the casing, is provided with orilices n3, corresponding to those in the plate L', and which when the sliding plate is moved in one direction will be brought into registry with those in the plate L and be carried to one side of them and the orifices in that plate thereby closed when the sliding plate is moved in the other direction as will be readily understood.

The boiler and setting being constructed as above described may be firmly secured to its foundation, as when used on shipboard or otherwise, by any convenient means. In the drawings, however, this is shown accomplished by the rods P, whicl1,secured at their upper ends to the ends of the steam and water drums D and D by screws p, extend downward through the foundation for the boiler and are provided on their lower ends, on the under side thereof, 4with suitable nuts p' or other appropriate fastening devices, as preferred.

It will thus be seen that I produce aboiler of the class in which the alternate series of water-tubes are inclined in opposite directions that is not only simple and compact in construction, but one in which the vertical walls of either the sides or the front and rearv of the nre-box are formed by downwardly-extended portions of the headers at the lowermost ends of the various series of watertubes, whereby the radiated heat from the fuel combustion heretofore absorbed by the boiler casing or setting is made available for converting the water into steam, and thereby attain greater efficiency and economy in the use of fuel than has been possible with this class of boilers as heretofore constructed.

Although in the foregoing I have described the best means contemplated by me for car rying my invention into practice, I wish it distinctly understood that I do not limit myself strictly thereto, as it is obvious that Iy may modify the same in various ways vwithout departing from the spirit thereof.

Having now described my invention. and specified certain of the ways in which it is or may be carried into effect, I claim and desire to secure by Letters Patent of the United Statesl. The combination, with a plurality of series of oppositely-inclined water-tubes, a fireboX for cooperating with them,and a plurality of connected steam and water drums, of muddrums, headers for the opposite ends of the water-tubes, the under of which are provided with` downwardly-extended portions to form a portion of the vertical walls of the reboX and connect with the mud-drums, and tubes andnipples whereby the water-drnms are con- IIO nected and the various headers likewise connected with them, substantially as described.

2. The combination, with a plurality of series of oppositely-inclined water tubes, a steam and water drum arranged over each of the ends of these series, tubes for connecting these steam and water drums, and a dre-box for coperating,r with the water-tubes, of muddrums, headers for the opposite ends of such series of water-tubes, the under of which are provided with down wardly-extended portions to form a portion ot the vertical walls of the fire-box and connect with the mud-drums, nipples for connecting the upper ends of the upper headers with their respective steam and water drums, and tubes for connecting the under headers with the oppositely-arranged steam and water drums, extending across from the upper portions of such headers to said drums, substantially as described.

3. The combination, with a plurality of series of oppositely-inclined Water -tubes, a steam and water drum arranged over each of the ends of these series, tubes for connecting these steam and water drums, a lire-box, and an ash-pit, of mud-drums, headers for the opposite ends of such series of water-tubes, the under of which are provided with downwardly-extended portions to form a portion of the vertical walls of the fire-box and ashpit -and connect with the mud-drums, nipples for connecting the upper ends of the upper headers with their respective steam and water drums and the downwardly-extended portions of the under headers with their respective mud-drums, and tubes for connecting the under headers with the oppositely-arranged steam and water drums, extending across from the upper portions of such headers to said steam and water drums, substantially as described.

4. The combination, with a plurality of series of oppositelyinclined water-tubes, a steam and water drum arranged over each of the ends of these series, tubes for connecting these steam and water drums, and alire-box for coperating with the water-tubes, of muddrums, headers for the opposite ends of such series of Water-tubes, the under of which are provided with downwardly extended portions to form a portion of the vertical walls of the lire-box and connect with the muddrums, nipples for connecting the upper ends of the upper headers with their respective steam and Water drums, and tubes for connecting the under headers with the oppositely-arranged steam and water drums extending `across from the upper portions of such headers to said drums, substantially as described.

5. The combination, with a plurality ot' series of oppositely-inclined water-tubes, steam and water drums, tubes by which they are connected, a casing for such parts, a tire-box for cooperating with the water-tubes and muddrums, of headers for the opposite ends of such series of water-tu bes, the under ot which are provided with downwardly-extended portions to form the side walls of the tire-box and connect with the mnddrums, means whereby the various headers are connected with the steam and water drums, a door for the tirebox arranged in the end of the casing, filling means interposed between the lowest tubes of various of the front and middle series ot' water-tubes and other filling means interposed between the highest tubes of various of the rear and middle series thereof, whereby a sinuous course is imparted to the4 heat and other products of combustion in traveling from the lire-box to the uptake, substantially as described.

6. The combination, with a plurality of series of oppositely-inclined Water-tubes, steam and water drums, tubes by which these drums are connected, a fire-box and mud-drums, of headers for the opposite ends of the watertnbes, the under of which are provided with downwardly-extended portions to form a portion of the vertical Walls of the iire-box and connect with the mud-drums, means whereby the various headers are connected with the steam and water drums, and a stand or support upon which these several parts rest and are supported provided with an ash-pit, substantially as described.

7. The combination, with a plurality of series of oppositely-inclined water-tubes, steam and water drums, tubes by which these drums are connected, a tire-box, and mud-drums, of headers for the opposite ends of the watertubes the under of which are provided with downwardly-extended portions to form a portion of the vertical walls of the fire-box and connect with the mud-dru ms, means whereby the various headers are connected with the steam and water drums, a stand or support upon which these various parts rest and are supported and a casing inclosing such parts, substantially as described.

8. The combination, with/a plurality of series ot' oppositely-inclined water-tubes, steam and water drums, tubes by which these drums are connected, a tire-box, and mud-drums, ot' headers for the opposite ends of the watertubes, the Linder of which are provided with downwardly-extended portions to form a portion of the vertical walls of the fire-box and connect with the mud-drums, means whereby the various headers are connected with the steam and ,water drums, a stand or support upon which these various parts rest and are supported, a casing inclosing said parts, and an ash-pit formed within the stand, substantially as described.

9. The combination, with a plurality of series of oppositely-inclined water-tubes, headers forthe opposite ends of such tubes, and means whereby these various series of tubes are connected to permit of the circulation of IOO IIO

the water through them, of a casing for said parts provided with orifices for the introduction of a, jet of steam or air located opposite the space between the upper and under headers, and a sliding plate provided With orifices corresponding With those in the casil1g,vvhere by these orifices in such casing may be opened and closed by moving such sliding plate in one and the other direction, substantially as described. 1o

In testimony whereof I have hereunto set my hand this 4th day of January, 1901.

AMASA WORTHINGTON. Witnesses:

WM. I-I. APPLETON, FRANK S. OBER.

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