US642546A - Boiler-furnace. - Google Patents

Description

No. 642,546. Patented Jan. 30,1900.

w. E. COLE.

BOILER FURNACE.

:Application filed July 18, 1899.) 0

(No Model.) 2 Sheets-Sheet l.

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No. 642,546. I Patented Ian. 30, I900.

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BOILER FURNACE.

(Application filed July 18, 1899.)

(No Model.) 2 Sheets-Sheet 2.

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Hm P 1 L tion of the free carbon and the gases.

UNITED STATES PATENT @EEIQE.

W LLIAM E. com, or ATLANTA, GEORGIA;

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent no. 642,546, dated January 30, 1960.

Application filed July 1%;1899. Serial No. 724,222. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM E. COLE, of Atlanta, in the county of Fulton and State of Georgia,have invented certain new and useful Improvements in Boiler-Furnaces, of which the following is a specification.

This invention has relation to means-for consuming the combustible products of combustion of coal, its object being to provide a simple device for supplying oxygen in sufficient quantities and at a proper temperature to effecta perfect combustion in the fire-box, and while, as I shall subsequently explain, the invention is particularly applicable for use in connection with locomotive-boiler furnaces, at the same time it may be used efficaciously in conjunction with stationary and other furnaces.

In order to effect the consumption of the carbon and the gasessuch as carbu reted hydrogen or hydrocarbons distilled in the combustion of coalit is necessary, first, that there should be sufficient oxygen; second, that the oxygen should be thoroughly commingled with the gases, and, third, that they should be ignited. In meeting these requirements care should be taken not to disturb or impair the steaming qualities of the boiler by subtracting heat units from the water therein and, further, not to affect the draft through the fire-box. According to my invention as I have illustrated it on the drawings, I provide a construction in which atmospheric air is first preheated and then delivered into the fire-box substantially in the center of the flame. region and thoroughly commingled with the gases, the supply of oxygen being sufficient to cause the consump- The twyers through which the air isintroduced are preferably located below the rear lower edge of the usual arch which extends across the fire-box above the grate-bars and is separated from the flue-sheet by a small space, the lower edge of the said arch being substantially in the plane of the lower tubes. The twyers project across the said space between the arch and the fine-sheet and are provided at their ends with outlets for discharging the preheated air in front of said space, whereby it ultimately follows the currents of the products of combustion and passes therewith in front of and over the forward edge of the arch into the chamber thereabove. This arch is formed of fire-brick or other material which maybe heated to incandescence by the fire in the fire-box, and the twyers consist of waterjacketed tubes, the water-chambers therein communicating with the water leg of the boiler. The air is preferably heated by the waste products of combustion, such as carbon dioxid, in the extension-front of the boiler and is conducted through a suitable conduit, properly covered with asbestos or other heat-noncond uctin g material,to a manifold located outside and beyond the fire-box and from which the twyers project through the water leg into the fire-box. There are as many twyers as are necessary to introduce sufficient oxygen for the consumption of all the carbon and distilled gases without furnishing an excess of oxygen to injure the boiler-tubes. From this construction and arrangement of parts it will be apparent to those skilled in the art to which this invention relates that the air is first preheated to a relatively high temperature and then delivered into the fire-box without taking any heat from the boiler. As soon as it enters the fire-box it is raised to a still higher temperature by the arch to a point of ignition and is thoroughly commingled or mixed with the gases and carbon from the burning coal. By first preheating the air before it is delivered below the arch there is no tendency to reduce the temperature of the arch below the point of ignition of gases, as would be the case were the air admitted cold to the fire-box. Consequently the carbon and the gases are consumed before they enter the boiler-tubes, and the heat units are substantially all absorbed by the boiler, with the effect of greatly increasing the steaming qualities thereof. By introducing the air in front of the space which separates the arch from the flue-sheet the air is caught up, as I have previously stated, by the current of the products of combustion and is swirled around therewith and carried in front of and over the arch, and thereby prevented from passing directly through the lower tubes of the boiler, and at the same time by providing the said space sufficient heat is allowed to pass through the said lower tubes to heat them to the desired temperature. Moreover, the sepa ration provides for the discharge therethrough of the cinders which are carried upward by the draft over the front edge of the arch and ledge on the top thereof.

It is of course obvious that some parts of the invention may be employed without the others and that it may be embodied in various forms.

Referring to the accompanying drawings, which illustrate one embodiment of my invention which I have selected for the purpose of disclosure, Figure 1 represents a locomotive of the modern type equipped with my invention. Fig. 2 represents a transverse section through the extension-front of the boiler. Fig. 3 represents a longitudinal vertical section through the same. Fig. 4 represents a longitudinal section through the same and shows the twyers. Fig. 5 is a horizontal section through the fire-box and the twyers. Fig. 6 represents a vertical section therethrough. Fig. 7 shows one of the Water-jacketed nozzles.

Referring to the drawings thus briefly described, it will be seen that I have shown a locomotive of a modern type having a firebox 1, a boiler with ubes 2, a water-leg 3, and grate-bars 4. The grate-bars of the firebox are dropped considerably below the horizontal plane of the lowest boiler-tubes, and

said box is provided with an arch 5, extending across it from side to side. The said arch is preferably formed of fire-brick or other suitable refractory material that is capable of being heated to incandescence, and it is inclined from the flue-sheet 6 upward and forward to form a baffle-plate to temporarily retard the products of combustion of the coal on the grate-bars. The rear lower edge of said arch is separated from the flue-sheet 6 at a plane parallel with or slightly below the lowest boiler-tubes by a space 7, this being for. two reasonsn amely, to provide for the discharge of cinders which are carried upward by the draft through the fire-box and are lodged on the top of the arch, and, second, to permit some of the products of combustion to pass through the lower tubes, and thereby render all of the tubes effective.

The boiler is provided with the ordinary extension-front 8 beyond the outer ends of the boiler-tubes and the diaphragm 9 and through which the waste products of combustion pass to the stack 10, extending upwardly therefrom. The steam-exhaust pipe 11 is located directly under the stack in the ordinary way to effect a powerful forced draft through the fire-box and the boiler-tubes.

Located outside of and beyond the outer wall 12 of the water-leg is a pipe or manifold 13, supported by any suitable devices, and from it a plurality of pipes 14 connect with a similar number of air-tubes, twyers, or nozzles 16, which enter through the water-leg 3 into the fire-box. Said twyers or nozzles project across the space 7 below the rear lower end of the arch and their ends are some distance in front of said end of the arch, as shown Fig. 1. The other ends of said twyers are fixed in the other wall 12 of the water-leg by expanding them or in any other suitable manner.

Surrounding the twyers or nozzles 16 are water-tubes or water-jackets 17, whose inner ends are formed with seamless inwardly-projecting flanges 15, secured tightly on the projecting ends of said twyers by expanding the latter. The outer ends of said jackets are threaded into the flue-sheet, and hence the annular compartments in the jackets communicate with the water-leg, whereby water can freely circulate through them. The jackets, therefore, not only protect the twyers from the heat, which is usually most intense below the arch, but also furnish a greater heatingsurface for the boiler, so that a higher pressure of steam may be obtained, other conditions being equal, than heretofore.

The twyers and their water-jackets may be varied in number, care being taken to prevent their obstructing the space 7 in such way as to stop the passage of some of the products of combustion through the lower tubes and the collection of cinders upon the arch. Air is admitted through said twyers into the fire-box to furnish oxygen for the consumption of the free carbon and the gases distilled during the combustion of the fuel on the grate-bars, and it is preheated prior to its delivery to the manifold by a heater located in the extension-front, to which I have already referred.

The heater consists of a plurality of straight parallel tubes or pipes 18, arranged longitudinally in the extension-front, on both sides thereof, in the path of the heated carbon dioxid and other waste products of combustion which pass through the boiler-tubes from the fire-box. Said tubes or pipes 18 are connected by U-joints or elbows, those on the two sides of the said extension-front communicating through a transverse pipe 19. The end of the pipe of one of the series extends through the shell 20 of the said front and connects with a forwardly-projecting funnel 22, while that at the other end of the series extends through said shell and connects with a conduit 21, leading to themanifold 13. The conduit is located entirely outside of the .boiler, and it and the manifold are covered and protected by a thick layer of asbestos or other suitable heat-nonconducting material. I

By this construction and arrangement of parts when the locomotive is in motion air enters the funnel 21 and in passing through the heater is raised to a relatively high temperature. It then passes through the covered conduit to the manifold 13 and is discharged therefrom through the twyers or nozzles into the fire-box while in its highlyheated condition without subtracting any of the heat units from the water in the boiler. The nozzles discharge the air in front of the rear lower end of the arch into the chamber below the arch, so that it is thoroughly mixed with the free carbon and the gases, and the resultant admixture is ignited immediately by the incandescent arch and the flames of the burning coal. The air is caught by the rising currents of the products of combustion and is carried therewith in front of and over the front end of the arch, and by the time they reach the boiler-tubes substantially all the combustible products of the initial combustion are consumed. This result I have ascertained from severe practical tests under unfavorable conditions, in which I found that the waste products of combustion issuingfrom the stack were practically colorless and that the steaming qualities of the boiler were greatly enhanced with a smaller consumption of fuel than has heretofore been required.

I believe myself to be the first to have employed air tubes or ducts so arranged with relation to the vertical sheets of the box and relative to the grate as to not interfere with utilizing the entire horizontal area of the box for containing hot coals directly in contact with the water-sheets around the entire grate and at the same time so arranged as to project well into the body of the box and deliver the air in streams or jets directed along lines which are horizontal or somewhat upwardly inclined through orifices at the ends of the air-ducts capable of delivering it, as said, in streams or jets in contrast with tubes provided with a large number of minute perforations. The air-ducts in my construction are practically indestructible, notwithstanding the fact that they are in a region where they are subjected to a very intense heat. As shown, the twyers or nozzles are approximately horizontal, this arrangement being selected because of the fact that the upwardlyrising volumes of gas tend to deflect the air jets or streams, thus insuring that the air, on the one hand, will not impinge downward against the fuel mass in the way incident to some of the earlier constructions or, on the other hand, rise quickly and directly against the under side of the arch at its inner edge in the way incident to other constructions. I have discovered that it is not so much the mere presence of a large volume of oxygenbearing air that is necessary for perfect combustion as it is that such air as is admitted shall be delivered at a certain region and so as to properly impinge upon the rising volumes of gas and pass with them toward and over the front edge of the incandescent arch. The air-currents, the rising gases, and the arch all act to compel an intimate comminglin g with said gases of the newly-introduced air at the points and at the time necessary for rapid and complete combustion. Not only is the air not directed relatively downward against the coal at the front part of the grate to interfere with the copious releasing of the hydrocarbon gases and prevent a relatively rapid combustion of the coal at that region, but at the same time it is not directed downward against the fuel mass at the inner or rear end of the grate, where material additions of air above the coal are not necessary, that air being sufficient which reaches the highly-incandescent coal through the ordinary ducts as, for instance, through the grate; nor, again, is it delivered,- as in earlier constructions, through a'multitude of minute orifices which prevent it from escaping in streams or jets with any degree of force or precision and which merely place the air below the inner or rear end of the arch, whence it is at once carried upward through the cinder passage-way and into the flues with out performing its full oxidizing work. On the contrary, in contradistinction from all of these, I so construct and arrange the air-deliverin g devices that, as aforesaid, the orifices are well remote from the sheets of the firebox and so disposed as to insure that the streams or jets issuing therefrom shall be carried with more or less precision (and. more or less force where the injector is used) in awelldefined direction,theycommeneingtoimpinge upon the hydrocarbon gases at points well backward under the arch. As is well known, fire-boxes of the class of that herein are, according to the common practice, fed with fuel in such manner that the following conditions are to be noted: Near the back sheet and under the fuel-door the coal is initially received and remains for a period of time as green coal in the next succeeding area toward the flue-sheet is found the previously-introduced coal which has now become comparatively well heated andis releasinga great part of the gaseous hydrocarbon consituents. In successive areas this reaches its maximum, a species of distillation being at work to eliminate or drive off those hydrocarbon bodies which escape as the higher heat is experienced. Then. come areas further inward,where the coal can be considered as coke-like in character, and, finally, there are areas adjacent to the fluesheet,where is occurring the combustion of the virtually true carbon which has been freed of the more easily-vaporizable hydrocarbon bodies. Of course not all of the green coal is deposited into the fire-box at the front end near the back sheet, for the fireman usually scatters a shovelful or two over the fire at the fire-zone in the middle portion of the box, and where a hole is torn through the fire on the grate by the draft fills it with green coal. In most cases, however, the majority of the green coal is put into the box at the front end, so that it is worked by reason of the violent draft or by the fireman toward the flue-sheet, whereby it passes through the successive areas, as described.

Now in many of the earlier mechanisms intended for the present purpose the parts have been so arranged as to deliver the air at points immediately adjacent to the inner or flue sheet of the fire-box. In some cases a large part of such air was delivered at once to the inner or rear areas just referred to, where is found the highly-heated true carbon; but this IIO does not demand the introduction of these extraordinary volumes of external air, such demand for oxygen as exists at those regions being easily filled by the air rising through the grate-bars. It is the dense volumes of hydrocarbon vapors and gases that rise from the coal masses in the areas referred to at the fire-zone which have caused the trouble incident to unconsumed carbon, smoke, and cinders escaping from the furnace, and it is the rapid and complete combustion of these volumes of vapor and gas that I aim to cause,

and I accomplish it by so introducing the air that neither its volume nor its force shall be dissipated at points where not required, but shall be exerted at the ends of the relatively longinwardly-projected air-ducts and byemploying conjointly therewith the constantly present and immediately adjacent incandescent mass of the arch, which not only brings the burning bodies to an intensely high heat, but also insures that the currents or jets thereof shalLbe properly com mingled to form a homogeneous gaseous mass ready for combustion at and near the front edge of the arch. This end cannot be attained to advantage when the air-jets are directed in such way as to interfere with the proper movements of gas and airas, for instance, by forcing it backward and downward. Nor can it be reached by the employment of an arch incapable of being heated above a fixed degree-as, for instance, a water-jacketed arch which will prevent the temperature of itself and ofits neighborhood from rising above the temperature of the water, the latter being never higher than from two hundred to two hundred and seventy-five degrees-many hundreds of degrees below that necessary for rapid ignition and combustion. Hence my construction is to be quickly distinguished from all of those including arches with bodies whose interiors were open to communication from the exterior of the fire-box either for the introduction of water or air, as it is impossible to utilize such arches as expedients for ignition or combustion.

The location of the heater is such that it does not subtract heat from the boiler, the

same being true of the conduit which leads therefrom to the manifold, and yet at the same time the air is heated to such an extent that when it enters the fire it does not bring the arch below a white heat.

I have found that it is frequently necessary when a locomotive is at rest to positively in duce a current of air from the heater to the manifold 13, and to effect the same I employ an injector 23 and connect it with a live-steam pipe 24 in the cab, as shown, or with the exhaust in the stack. Any suitable injector may be used that will accomplish the desired purpose.

Another feature in the construction and arrangement of parts thus described to which I wish to draw attention is that the location of the twycrs or nozzles does not affect the natural draft of the furnace, for the currents of air do not pass in a direction opposite the path of the currents of the products of combustion, bu t, on the contrary, tend to increase the draft by moving in the same direction therewith. I

Having thus described one embodiment of my invention and explained its operation, without having attempted to set forth all of the forms in which it may be made or all of the modes of its use, I declare that what I claim is- 1. In a boiler-furnace, the combination, with a fire-box having a fueldoor in one end and the fines communicating with the other end, and an arch of refractory material capable of being heated to incandescence, and having a vertical passage-way adjacent to the flue-sheet, said arch having its body closed against communication with the air exterior to the fire-box, of the water-tubes below and independent of said arch and extending to points beyond the vertical lines of said passage-way, and air tubes or nozzles extending through the said water-tubes, and having orifices in their ends which deliver air under the central part of the arch and direct it in jets forward toward the back sheet.

2. In a boiler-furnace, the combination, with a fire-box, having a fuel-door. at one end and boiler-fines com municating with the other end, water-tubes extending forward from the flue-sheet into the fire-box and arranged to have vertical passageways between them, air tubes or nozzles situated within the watertubes, and having their delivery-orifices forward of and remote from the flue-sheet, and an arch arranged and supported independently of the said water-tubes and air-tubes, and having a vertical passage-way above the passage-way between the said tubes, and near the flue-sheet.

3. In a boilerfurnace, the combination, with a fire-box, having a fuel-supply door at the front end and boiler-flues communicating with it at the rear end, of a gas-deflecting arch at the said rear end, water-tubes extending into the fire-box to points beyond the inner surface of the flue-sheet and situatedbelow and independently of the arch, and air tubes or nozzles passing through the watertubes, and each provided with an orifice in its inner end adapted to direct the air-jets directly toward the front end of the fire-box on lines below the arch.

4:- In a boiler-furnace, the combination, with a fire-box having a f uel-door at one end, water-legs at the sides and ends, and a grate at the bottom on which a mass of coal extending from the door end to the inner end wall of the water-leg at the opposite end of the fire-box can be supported, whereby the outer part of the said coal mass can have the gaseous components driven olf while the inner part of said mass is highly incandescent and freed from the said gaseous components, boiler-fines communicating with the fire-box IIO ISO

at the rear end thereof, an arch at the rear end of the fire-box inclined upward from the flue-sheet and having its front edge over the region of evolution of the larger amount of gaseous products, one or more air-ducts extending beyond the inner surface of the rear water-leg of the fire-box and delivering jets of air from the end or ends thereof approximately near said region of evolution of gaseous products, said jets being directed toward the forward edge of the arch and the front of the fire-box.

5. In a boiler-furnace, the combination of a fire-box, having the fuel-door in the front end, the flues communicating with the rear end, water-legs at the ends and sides of said fire-box, an arch of refractory material capable of being heated to incandescence and having its body closed against communication with the air exterior to the fire-box, and a grate at the bottom of the fire-box and extending from the rear water-leg to points in front of the arch, said grate, firebox, fueldoor, and arch being arranged to permit the retaining on the grate of a relatively shallow mass of incandescent fuel immediately below the rear end of the arch, and a graduallydeepening mass of fuel extending from the inner incandescent part to the outer end of the fire-box, one or more air-ducts passing through the rear water-leg and situated entirely above the fuel mass and having their delivery ends situated at points remote from and behind the front end of the arch and arranged to deliver jets of air in the direction of the front edge of the arch whereby said air initially mingles with the gases evolved from the coal near the back sheet and assists in directing said gases over the front edge of the arch and igniting them under the incandescence of the arch.

6. In a boiler-furnace, the'combination, with the fire-box having water-legs at its sides and ends, an inwardly and downwardly inclined arch having a vertical passage-way at its rear edge and a relatively large passageway over its front edge, and a series of Wator-jacketed air-tubes situated below and independently of the arch, each having an orifice at points in the fire-box remote from the rear water-leg and'turned to direct the jet of air into the gaseous products of combustion on lines extending forward toward the back sheet whereby said jets of air are prevented from impinging on the fuel-bed and from rising upward immediately below the rear edge of the arch.

7. A smoke-consuming device, comprising a fire-box having an arch separated at its rear end from the flue-sheet of the boiler, and one or more twyers or nozzles through which air is introduced into the fire-box, said nozzles being located below the said rear end of the arch, and being sufficiently long to project beyond the same to cause the air admitted through them to be caught by the rising currents of the products of combustion and carried under and over the front end of the arch.

8. The combination of a fire-box, having an arch whose rear edge is separated from the flue-sheet, and one or more water-jacketed twyers or nozzles extending through the Water-leg of the boiler for admitting air to the fire-box, said twyers or nozzles projecting for- 'ward'heyond the said rear end of said arch to cause the air admitted therethrough to be.

caught by the rising currents of the products of combustion and carried therewith in front of and over said arch.

9. The combination of a tire-box, having an arch of refractory material adapted to be heated to incandescence, a plurality of airtubes for delivering air into the fire-box under said arch, and an independent waterjacket for each of said tubes, whereby said arch is exposed on its under side for igniting the combustible gases.

10. The combination of a fire-box having an incandescible arch with a vertical passageway adjacent to the flue-sheet, a plurality of air-tubes arranged under the arch and projecting from the flue-sheet in a direction toward the front end thereof, and an independent water-jacket for each tube, said waterjackets being separated so as not to obstruct said passage-way.

11. A smoke-consuming device, comprising a fire-box, an arch of refractory material capable of being heated to incandescence, water-jacketed twyers or nozzles below and independent of said arch for introducing air to the fire-box under said arch, and means for preheating said air to a high temperature be fore it is delivered to said twyers or nozzles, whereby said air is commingled in a heated condition in the fire-box with the products of combustion, and the admixture is ignited by the said arch and the flames resulting from the combustion of the coal.

12. The combination ofafire-box,having an arch adapted to be heated to incandescence by the fire, a plurality of water-jacketed twyers or nozzles located below and independent of said arch for admitting air into proximity thereto, a manifold located outside of said fire-box and with which said twyers or nozzles communicate, and means for heating and delivering air to said manifold.

13. The combination with a locomotiveboiler furnace having a fire-box, with an arch adapted to be heated to incandescence and a boiler with an extension front through which the products of combustion pass, of a plurality of independently water-jacketed twyers or nozzles projecting into the fire-box above the grate-bars and below said arch, a heater located in said extension front and communicating with the atmosphere, and a conduit located outside of said boiler for conducting the heated air from said heater to said nozzles.

14. The combination with a locomotiveboiler furnace, having a fire-box with an arch adapted to be heated to incandescence located in front of the waterleg and a boiler with an extension front, of a plurality of twyers or nozzles projecting through the water-leg and adapted to deliver air under the arch, an independent water-jacket for each of said twyers or nozzles, a manifold located outside of the fire-box and communicating with said twyers or nozzles, a heater located in the extension front of the boiler, and a conduit for carrying heated air from said heater to said manifold.

15. The combination with a locomotiveboiler furnace having a fire-box with an arch whose rear end is separated from the fluesheet, of twyers extending through the waterleg below and forward beyond the said rear end of said arch, a manifold located outside the fire-box and communicating with said twyers, an air-heater located in the path of the products of combustion, and a conduit for delivering air from said heater to said manifold, said parts being constructed and arranged whereby air heated to a high temperature is delivered by the nozzles under and in proximity to the arch, and being caught by the products of combustion is carried upward therewith and around the front end of the arch 16. The combination with a fire-box having an arch adapted to be heated to incandescence, and having its rear end in proximity to the flue-sheet, of a plurality of twyers located below and adjacent to said arch at the said rear end thereof, and an independent water-jacket surrounding each of said twyers and communicating with the water-leg of the boiler, and means for heating air and delivering it to the said twyers.

17. The combination with a fire-box having a water-leg, and an arch adapted to be heated to incandescence, of a plurality of twyers or nozzles below and independent of said arch projecting into the fire-box beyond the internal wall thereof to introduce air into the firebox below the arch and mix it with the prodnets of combustion, said nozzles being covered with independent water-jackets communicating with said water-leg, whereby they furnish a greater heating-surface for the water in the boiler and protect the twyers from intense heat.

18. The combination of a fire-box having an arch, and water-jacketed tubes independent of the arch projecting through the water-leg of the boiler and arranged to deliver air below said arch, said tubes being separated by a free space and having their internal annular water-chambers communicating with said water-leg.

19. The combination with a fire-box having a water-leg, of a nozzle or twyer projecting through the water-leg beyond the inner wall thereof, to introduce air into the fire-box and mix it with the products of combustion, said twyer or nozzle having its outer end secured in the outer wall of said water-leg, and a tubular water-jacket covering said twyer or nozzle and having its inner end secured to the inner end thereof, said water-jacket having its outer end secured to the inner wall of the water-leg, whereby water from the boiler is free to circulate through the annular space between the nozzle and the jacket.

20. The combination with a fire-box and a boiler having a water-leg, of a twyer projecting through said leg into the fire-box beyond the inner wall of said leg to introduce airinto said box and mix it with the products of combustion, and a tubular water-jacket having a seamless inner end secured on the end of the twyer and an outer end affixed to the inner wall of the water-leg, substantially as described whereby leaking of the water from said leg into the fire-box is prevented.

In testimony whereof I have affixed my signature in presence of two witnesses.

WILLIAM E. COLE.

Vitnesses:

MAnoUs B. MAY, WM. KIRK.

Correction in Letters .uwm

It is hereby certified that Letters Patent No. M2546, granted January 30, 1900,

of William E. Cole, Atlanta, Georgia, for an improvement in upon the application f said invention;

Boiler-Furnaces, were erroneously issued to said Cole as owner 0 aid Letters Patent should have been issued to the Locomotive Smoke Preve Company, of New York, N. Y. said company being owner by mesne assignments of the entire interest, as shown by the record of assignment in this office; and that the said Letters Patent should be read with this correction therein that the same may conwhereas s nter form to the record of the case in the Patent Office.

Signed, countersigned, andsealed this 6th day of March A. D., 1900.

[SEAL] THOS. RYAN,

First Assistant Secretary of the Interior.

Countersigned O. H. DUELL,

Commissioner of Patents.

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