US846737A - Water-tube boiler. - Google Patents

Water-tube boiler. Download PDF

Info

Publication number
US846737A
US846737A US27843805A US1905278438A US846737A US 846737 A US846737 A US 846737A US 27843805 A US27843805 A US 27843805A US 1905278438 A US1905278438 A US 1905278438A US 846737 A US846737 A US 846737A
Authority
US
United States
Prior art keywords
water
drum
tubes
steam
drums
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US27843805A
Inventor
William S Elliott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US27843805A priority Critical patent/US846737A/en
Application granted granted Critical
Publication of US846737A publication Critical patent/US846737A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/34Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
    • F22B21/346Horizontal radiation boilers

Definitions

  • My invention relates to that class of watertube boilers wherein the drums are longitudinal of the setting and the flame and gases flow from a front fireplace or a source of heat through up-and-down passes over successive tubes connecting upper and lower drums.
  • the object of the invention is to provide a simple, efficient', and economical boiler of this type.
  • These tubes may be of any desirable number and may be connected into the drums by curving their ends or by using straight tubes with struck-up tube-seats.
  • the three sets of tubes 8, 9, and 10 are separated by the baffles 11 and 12, the baffle 11 extending upwardly to a short distance below the upper end of the tubes, while the baffie 12 extends downwardly, thus directing the gases through three up and-down passes among the tubes connecting the upper and lower drums before they reach the outlet-flue 13.
  • the roof of the combustion-chamber is preferably formed of tiles or refractory bricks 14, which lie upon a series of bent tubes 15, which extend from the fronttransverse water-drum header or chamber 1 6 upwardly and rearwardly, the rear portions of the tubes beingbent and joined into the upper drum.
  • the water-chamber 16 is connected to the forwardly-extended portions of the upper drums by vertical pipes or tubes 17, of which I have shown three for each upper drum.
  • the number of these tubes may be varied; but I prefer to make them less in number than the tubes 15.
  • I may use more than one row of tubes 15 and also more than one row of tubes 1.7, connecting them to the same chamber or individual chamber.
  • the chamber 16 may be entered by suitable manholes and manhole-plates at the ends if drums are employed, or hand-hole plates may be used on the sides if the chamber is of header form.
  • Each steam and water drum 2 is preferably provided in its rear portion with a transverse separating-partition 18, which is provided with a manhole and manhole-plate 19 and with an upper hole 20, which equalizes the steam-pressure between the front and rear chambers of each steam and water drum.
  • the partition 18 is preferably placed slightly ahead of the baffle 12, so that some of the tubes 9 in front of the bafiie 12 will be between this baffie and the plane of the diaphragm 18. This arrangement causes a moderate circulation up through the rear tubes of the set 9 and down through the tubes 10. The deposition of sediment is thus lessened and the boiler is improved in this regard over many boilers of the general type, in which there is practically 'no circulation among the rear tubes, and consequently there is a heavy deposition of sediment through the tubes in this part.
  • I provide one or more chambers 28, which are reached through holes in the side walls. By entering these chambers the operator can reach any of the tubes for removal and replacing.
  • I provide s aces between the side tubes and the side wa of the setting and also between the adjacent-side tubes of the units, in case two ormore'units are used, these spaces being wider than the diameter of a tube. In this way I am en'ab'led'to provide for the easy removal or replacing of any of the water-tubes.
  • the mud-drums are preferably supported by the water-tubes'that is,'they hang on the tubes and are supported independently of the setting. This provides for expansion and contraction independent of the walls and avoids strains on the setting.
  • I provide the cross steampipes 23, and also preferably employ cross water-pipes 24 between the water-spaces of the steam and water drums.
  • I may also use cross water-tubes between the muddrums for the same purpose, or I may use cross water-tubes both between the waterdrums and the mud-drums.
  • Fig. 2 25 represents the steam-outlet, and 26 the point of attachment of the safety valve.
  • the invention may be employed by using one unit or placing as'many of the units side by side as may be desired, the unit consisting of the upper drum with its mud-drum and supplemental water-chamber, &c.
  • the chamber 16 may be formed as a continuous chamber or drum the entire width of the setting or it may consist of two or more sections arranged end to end.
  • I claim 1 In a water-tube boiler, a longitudinal upper steam and water drum, a lower longitudinal mud-drum which is shorter than the upper drum, tubes connecting the two drums, transverse baflies between said tubes, and a front transverse water-chamber having tubes connecting itto the steam and water drum; substantially as described.
  • a longitudinal upper steam and water drum a lower longitudinal mud-drum which isshorter than the upper drum, tubes connecting the two drums, transverse baffles between said tubes, and a front transverse water-ch amber having tubes connecting it to the steam and waterdrum with a baffle lying on said tubes over the furnace-chamber; substantially as described.
  • a longitudinal-drumboiler of the water-tube type having a transverse partition in the steam" and water drum extending above the water-level, and a baflie in the rear of the partition arranged. to cause a moderate up-and-down circulation in the rear of said partition; substantially as described.
  • a longitudinal upper steam and water drum a lower longitudinal mud-drum, tubes connecting the two drums, baffling between said tubes, and a front transverse water-chamber between the levels of the steam and water drum and the mud-drum and having tubes connecting it to the steam and water drums; substantially as described.
  • a longitudinal mud-drum In a water-tube boiler, a longitudinal mud-drum, a longer longitudinal steam and water drum extending infront of the muddrum and connected thereto by watertubes, a furnace in front of the mud-drum and under the steam and water drum,'a transverse water-chamber near the front wall, and tubes connecting the chamber with the steam and water drum and extending over the furnace; substantially as described.
  • a longitudinal muddrum In a water-tube boiler, a longitudinal muddrum, a longer longitudinal steam and water drum extending in front of themuddrum and connected thereby by water-tubes, a furnace in front of the mud-drum and under the steam and water drum, a transverse water-chamber near the front wall, tubes connecting the chamber with the'steam and water drum and extending over the furnace, and bafflinglying on said tubes and over the furnace; substantially as described.
  • a mud-drum which'is shorter than the steam and water drum, a furnace in front of the mud-drum and under the steam and water drum, and a front transverse water-chamber having at least two sets of tubes connecting it to the upper steam and water drum, one set of tubes forming at least part of the roof of the furnace; substantially as described.
  • a mud-drum which is shorter than the steam and water drum, .a furnace in front of the mud-drum and under the steam and water drum, and a front transverse water-chamber having at least two sets of tubes connecting it to the upper steam'and water drum, one set of tubes formin at least part of the roof of the furnace and having baflling lying thereon; substantially as described.
  • a longitudinal-drum water-tube boiler having an up per longitudinal steam and water drum provided with a transverse partition extending above the water-level, and baffles in front of and in the rear of the partition arranged to cause longitudinal circulations on both sides of the partition.
  • a steam and water drum extending in front of the mud-drum, and a front transverse water-chamber hungabove the grate-level by water-tubes from the steam and water drum and having at least part of its tubes extending over the furnace; substantially as described.
  • a longitudinal upper steam and water drum a lower longitudinal mud-drum, tubes connecting the two drums, baffles between said drums, a furnace in front of the front end of the mud-drum, and a roof over the furnace consisting of water-tubes supporting baffles; substantially as described.
  • a steam and water drum having a transverse partition dividing it into compartments, and baffiing between the tubes in each compartment to give a circulation in each side of said partition; substantially as described.
  • transverse partition dividing it into compartments, and baffling between the tubes in each compartment to give a circulation on each side of said partition, the baffles dividing each set of tubes into sets of unequal numbers; substantially as described.
  • a steam and water drum having an intermediate transverse partition extending above the'water-level, a feed-water inlet in the rear watercompartment, and a baffle among the tubes in the rear of the partition and arranged to cause circulation in the water-tubes entering said rear compartment; substantially as described 15.
  • a water-tube boiler upper steamdrum and a lower mud-drum parallel therewith, tubes connecting said drums, and a front transverse water-chamber located between the levels of the steam d rum and the mud-drum havingtu'bes connecting it to the steam and water drums;- substantially as described.-
  • a water-tube boiler a steam and water drum, a lower mud-dram parallel therewith, tubes connecting the drums, baffies between said tubes, a water-chamber over the front of the furnace, said chamber being below the level of the steam and water drum and above the level of'the mud-drum, and water-tubes connecting the waterchamber to the steam and Water drum and forming at least a part of the roof of the furnace; substantially as described.
  • a furnace in front of the mud-drum, a water-chamber near the front wall, tubes connecting the chamber with the steam and water drums and extending over the furnace, and baflie-plates above the tubes and over the furnace; substantially as described.
  • a furnace in front of the mud-drum, a front water-chamber located .between the levels of the mud-drum and the steam and water drum having at least two sets of tubes connecting it to the upper steam and water drum, one set of tubes forming at least a part of the roof over the furnace; substantially as described.
  • a water-tube boiler having a lower mud-drum, an upper steam and water drum parallel therewith, water-tubes connecting said drums, and water-tubes supporting and forming at least a part of the roof of the furnace-chamber and having connections at two difierent points into the steam and water drum whereby a circulation is introduced with said steam and water drum, so as to form a complete cycle of circulation independent of the circulation due to the tubes connecting the steam and water drum with the mud-drum; substantially as described.

Description

No.f846 ,737 PATBNTED MAR.- 12,1907.
W. S. ELLIOTT.
WATER TUBE BOILER.
APPLICATION FILED SEPT. 14; 1905.
2 sums-sum 1.
juv'sm on I THE NORRIS PETERS 0a., wAsnlNcrurl, n. :4
PATENTED MAR. 12, 1907.
W. S. ELLIOTT. WATER TUBE BOILER. APPLICATION 11.21) 21 114, 1905.
2 SHEETS-SHEET 2.
IINVEIITOIR- WITNESSES UNITED STATES PATENT OFFICE.
WATER-TUBE BOILER.
Specification of Letters Patent.
' Patented March 12, 1907.
Application filed $epte1nber 14,1905. Serial No- 278,438.
To all whom, it may concern.-
Be itknown that I, WILLIAM S. ELLIOTT, of Pittsburg, Alle heny county, Pennsylvania, have invente a new and. useful ,l/Vater- Tube 'Boiler, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a front elevation, partly broken away, showing one form of my improved boiler and Fig. 2 is a sectional side elevation of the same.
My invention relates to that class of watertube boilers wherein the drums are longitudinal of the setting and the flame and gases flow from a front fireplace or a source of heat through up-and-down passes over successive tubes connecting upper and lower drums.
The object of the invention is to provide a simple, efficient', and economical boiler of this type.
It isvalso designed to provide heating-surface forming at least a part of the roof of the combustion-chamber, to provide an independent circulation for the water which is thus heated, to give easy action to the tubes, and to provide a moderate circulation in the rear portion of the boiler near the exit-flue.
In the drawings, in which I show a duplex form of the boilerthat is, nesting with two of my improved units side by side therein 2 2 represent the upper longitudinal steam and water drums, and 3 3 the lower longitudinalmud-drums. The steam and water drums are longer than -and preferably of greater diameter than the mud-drums. The steam and water drums extend from the front to the rear wall of the setting andpreferably over the entire length of the combustion chamber. Thus I show the combustion-chamber as formed with grates 4;, which extend continuously across the setting for its full width between the bridge-wall 5 and the front wall 6. The mud-drums 3 extend from the rear wall 7 to the bridge-wall 5. That portion of each upper drum which is above the corresponding mud-drum is connected therewith by tubes 8, 9, and 10. These tubes may be of any desirable number and may be connected into the drums by curving their ends or by using straight tubes with struck-up tube-seats. The three sets of tubes 8, 9, and 10 are separated by the baffles 11 and 12, the baffle 11 extending upwardly to a short distance below the upper end of the tubes, while the baffie 12 extends downwardly, thus directing the gases through three up and-down passes among the tubes connecting the upper and lower drums before they reach the outlet-flue 13.
The roof of the combustion-chamber is preferably formed of tiles or refractory bricks 14, which lie upon a series of bent tubes 15, which extend from the fronttransverse water-drum header or chamber 1 6 upwardly and rearwardly, the rear portions of the tubes beingbent and joined into the upper drum. The water-chamber 16 is connected to the forwardly-extended portions of the upper drums by vertical pipes or tubes 17, of which I have shown three for each upper drum. The number of these tubes may be varied; but I prefer to make them less in number than the tubes 15. I may use more than one row of tubes 15 and also more than one row of tubes 1.7, connecting them to the same chamber or individual chamber. The chamber 16 may be entered by suitable manholes and manhole-plates at the ends if drums are employed, or hand-hole plates may be used on the sides if the chamber is of header form.
Each steam and water drum 2 is preferably provided in its rear portion with a transverse separating-partition 18, which is provided with a manhole and manhole-plate 19 and with an upper hole 20, which equalizes the steam-pressure between the front and rear chambers of each steam and water drum. The partition 18 is preferably placed slightly ahead of the baffle 12, so that some of the tubes 9 in front of the bafiie 12 will be between this baffie and the plane of the diaphragm 18. This arrangement causes a moderate circulation up through the rear tubes of the set 9 and down through the tubes 10. The deposition of sediment is thus lessened and the boiler is improved in this regard over many boilers of the general type, in which there is practically 'no circulation among the rear tubes, and consequently there is a heavy deposition of sediment through the tubes in this part.
In the form shown the feed-water enters through pi e 21 and overflow-pan 22.
Below t e mud drum or drums I provide one or more chambers 28, which are reached through holes in the side walls. By entering these chambers the operator can reach any of the tubes for removal and replacing. For the same purpose I provide s aces between the side tubes and the side wa of the setting and also between the adjacent-side tubes of the units, in case two ormore'units are used, these spaces being wider than the diameter of a tube. In this way I am en'ab'led'to provide for the easy removal or replacing of any of the water-tubes.
The mud-drums are preferably supported by the water-tubes'that is,'they hang on the tubes and are supported independently of the setting. This provides for expansion and contraction independent of the walls and avoids strains on the setting.
In the operation of the boiler the flameand gases rise from'the fuel on the grate, heat the waterjin the pipes 15, and thence flow rearwardly through passes among the connecting-tubes of; the upper and lower drums to the outlet. There will-be a circulation of water up through the ing tubes 15, and down through the tubes 17. There will also be a strong circulation. up through the tubes 8 and down through the tubes-9, and these two circulations are additional tojthe rear circulation, which is de signedly made a moderate or rather slow circulation.
In order to equalize the steam-pressure when two or more units or sections are employed side by side, I provide the cross steampipes 23, and also preferably employ cross water-pipes 24 between the water-spaces of the steam and water drums. I may also use cross water-tubes between the muddrums for the same purpose, or I may use cross water-tubes both between the waterdrums and the mud-drums.
In Fig. 2, 25 represents the steam-outlet, and 26 the point of attachment of the safety valve.
27 represents a blow-off connection for the mud drum or drums.
The advantages of my invention result from the separate circulations which are obtained, from the cheapness of the structure,
from the circulating of the water in the rear portion of the boiler, from the heating of water in pipes or tubes forming a part of the roof of the combustion-chamber, and from the compactness of the setting. By extendthe steam and water drums forwardly beyond the front ends of the mud-drums I provide for the water-pipes over the combustionchamber and obtain increased economy. The amount of water-space and steam-space is also largely increased, thus giving greater storage capacity. I
It will be understood that the invention may be employed by using one unit or placing as'many of the units side by side as may be desired, the unit consisting of the upper drum with its mud-drum and supplemental water-chamber, &c. In case two or more the three up-and-down of the units are used side byside the chamber 16 may be formed as a continuous chamber or drum the entire width of the setting or it may consist of two or more sections arranged end to end.
. Many other variations may be made in the form and arrangement of the parts without departing from my invention. I claim 1. In a water-tube boiler, a longitudinal upper steam and water drum, a lower longitudinal mud-drum which is shorter than the upper drum, tubes connecting the two drums, transverse baflies between said tubes, and a front transverse water-chamber having tubes connecting itto the steam and water drum; substantially as described.
2. In a water-tube boiler, a longitudinal upper steam and water drum, a lower longitudinal mud-drum which isshorter than the upper drum, tubes connecting the two drums, transverse baffles between said tubes, and a front transverse water-ch amber having tubes connecting it to the steam and waterdrum with a baffle lying on said tubes over the furnace-chamber; substantially as described.
3. A longitudinal-drumboiler of the water-tube type having a transverse partition in the steam" and water drum extending above the water-level, and a baflie in the rear of the partition arranged. to cause a moderate up-and-down circulation in the rear of said partition; substantially as described.
4. In a water-tube boiler, a longitudinal upper steam and water drum, a lower longitudinal mud-drum, tubes connecting the two drums, baffling between said tubes, and a front transverse water-chamber between the levels of the steam and water drum and the mud-drum and having tubes connecting it to the steam and water drums; substantially as described.
5. In a water-tube boiler, a longitudinal mud-drum, a longer longitudinal steam and water drum extending infront of the muddrum and connected thereto by watertubes, a furnace in front of the mud-drum and under the steam and water drum,'a transverse water-chamber near the front wall, and tubes connecting the chamber with the steam and water drum and extending over the furnace; substantially as described.
6. In a water-tube boiler, a longitudinal muddrum, a longer longitudinal steam and water drum extending in front of themuddrum and connected thereby by water-tubes, a furnace in front of the mud-drum and under the steam and water drum, a transverse water-chamber near the front wall, tubes connecting the chamber with the'steam and water drum and extending over the furnace, and bafflinglying on said tubes and over the furnace; substantially as described.
7. In a longitudinaldrum water-tube boiler, a mud-drum which'is shorter than the steam and water drum, a furnace in front of the mud-drum and under the steam and water drum, and a front transverse water-chamber having at least two sets of tubes connecting it to the upper steam and water drum, one set of tubes forming at least part of the roof of the furnace; substantially as described.
8. In a longitudinal drum water-tube boiler, a mud-drum which is shorter than the steam and water drum, .a furnace in front of the mud-drum and under the steam and water drum, and a front transverse water-chamber having at least two sets of tubes connecting it to the upper steam'and water drum, one set of tubes formin at least part of the roof of the furnace and having baflling lying thereon; substantially as described.
9. A longitudinal-drum water-tube boiler having an up per longitudinal steam and water drum provided with a transverse partition extending above the water-level, and baffles in front of and in the rear of the partition arranged to cause longitudinal circulations on both sides of the partition.
10. In a longitudinal-drum boiler of the water-tube type, a steam and water drum extending in front of the mud-drum, and a front transverse water-chamber hungabove the grate-level by water-tubes from the steam and water drum and having at least part of its tubes extending over the furnace; substantially as described.
11. In a water-tube boiler, a longitudinal upper steam and water drum, a lower longitudinal mud-drum, tubes connecting the two drums, baffles between said drums, a furnace in front of the front end of the mud-drum, and a roof over the furnace consisting of water-tubes supporting baffles; substantially as described.
12. In a longitudinal drum water-tube boiler, a steam and water drum having a transverse partition dividing it into compartments, and baffiing between the tubes in each compartment to give a circulation in each side of said partition; substantially as described.
13. In a longitudinaldrum water-tube boiler, a steam. and water drum having a.
transverse partition dividing it into compartments, and baffling between the tubes in each compartment to give a circulation on each side of said partition, the baffles dividing each set of tubes into sets of unequal numbers; substantially as described.
14. In a longitudinal-drum boiler, a steam and water drum having an intermediate transverse partition extending above the'water-level, a feed-water inlet in the rear watercompartment, and a baffle among the tubes in the rear of the partition and arranged to cause circulation in the water-tubes entering said rear compartment; substantially as described 15. In a water-tube boiler, upper steamdrum and a lower mud-drum parallel therewith, tubes connecting said drums, and a front transverse water-chamber located between the levels of the steam d rum and the mud-drum havingtu'bes connecting it to the steam and water drums;- substantially as described.-
16. In a water-tube boiler, a steam and water drum, a lower mud-dram parallel therewith, tubes connecting the drums, baffies between said tubes, a water-chamber over the front of the furnace, said chamber being below the level of the steam and water drum and above the level of'the mud-drum, and water-tubes connecting the waterchamber to the steam and Water drum and forming at least a part of the roof of the furnace; substantially as described. l
17. In a water-tube boiler, an upper steamdrum, a lower mud-drum parallel therewith, tubes connecting the two drums, watertubes longitudinal with the furnace, forming at least a part of the roof of the furnace, and having their front ends connected to the upper steam and water drums, their rear ends connected to a water-chamber located between the levels of the steam and water drums and the mud-drum a set of tubes connecting the water-chamber with the steam and water drums; substantially as described.'
18. In a water-tube'boiler, having steam and water drums connected to parallel muddrums by water-tubes, a furnace in front of the mud-drum, a water-chamber near the front wall, and tubes connecting the chamber with the steam and water drums and extending over the furnace; substantially as described.
19. In a water-tube boiler, having steam and water drums connected to parallel muddrums by water-tubes, a furnace in front of the mud-drum, a water-chamber near the front wall, tubes connecting the chamber with the steam and water drums and extending over the furnace, and baflie-plates above the tubes and over the furnace; substantially as described.
20. In a longitudinal drum water-tube boiler, a mud-drum and a steam and water drum, a furnace in front of the mud-drum, a front water-chamber located .between the levels of the mud-drum and the steam and water drum having at least two sets of tubes connecting it to the upper steam and water drum, one set of tubes forming at least a part of the roof over the furnace; substantially as described.
21. A water-tube boiler having a lower mud-drum, an upper steam and water drum parallel therewith, water-tubes connecting said drums, and water-tubes supporting and forming at least a part of the roof of the furnace-chamber and having connections at two difierent points into the steam and water drum whereby a circulation is introduced with said steam and water drum, so as to form a complete cycle of circulation independent of the circulation due to the tubes connecting the steam and water drum with the mud-drum; substantially as described.
In testimony whereof I have hereunto set my hand.
WILLIAM S. ELLIOTT.
Witnesses:
G. M. Vnms, H. M. Conwm.
US27843805A 1905-09-14 1905-09-14 Water-tube boiler. Expired - Lifetime US846737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US27843805A US846737A (en) 1905-09-14 1905-09-14 Water-tube boiler.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27843805A US846737A (en) 1905-09-14 1905-09-14 Water-tube boiler.

Publications (1)

Publication Number Publication Date
US846737A true US846737A (en) 1907-03-12

Family

ID=2915201

Family Applications (1)

Application Number Title Priority Date Filing Date
US27843805A Expired - Lifetime US846737A (en) 1905-09-14 1905-09-14 Water-tube boiler.

Country Status (1)

Country Link
US (1) US846737A (en)

Similar Documents

Publication Publication Date Title
US846737A (en) Water-tube boiler.
US439684A (en) Sectional steam-boiler
US797107A (en) Steam-boiler.
US799265A (en) Steam-boiler.
US239355A (en) Bergh
US861040A (en) Water-tube steam-generator.
US704588A (en) Steam-boiler.
US558778A (en) Steam-generator
US227475A (en) pefess
US571595A (en) Boiler
US603089A (en) Boiler and furnace
US580196A (en) Water-tube boiler
US743271A (en) Steam-boiler.
US575118A (en) kinney
US616154A (en) Boiler
US834640A (en) Water-tube boiler.
US789818A (en) Water-tube boiler.
US253082A (en) Steam-boiler
US765443A (en) Water-tube boiler.
US655636A (en) Sectional steam-generator.
US716297A (en) Superheater
US808228A (en) Independently-fired superheater.
US752631A (en) Water-tube boiler
US750721A (en) Bo model
US756051A (en) Steam-generator.