Improvements in Water-tube Steam Boilers.
Year: 1898

page_text: [Communicated from abroad by JOHN A. STEVENS, of 25, Dutton Street, in the
City of Lowell, State of Massachusetts, United States of America, Engineer.]
Improvements in Water-tube Steam Boilers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord
Street, Liverpool, and 6, Bank Street, Manchester, both in the County of Lan-
caster, and Lower Temple Street, Birmingham, in the County of Warwick, Civil
Engineer, do hereby declare the nature of this invention to be as follows;-
My invention is more particularly a water tube boiler and furnace therefor,
adapted for land and marine service. It is designed to obtain a compact system
of drums and tubes of large heating surface for the circulation of water and
the generation of steam, in combination, with a high degree of economy and
efficiency in handling the products of combustion. The arrangement of drums
and tubes facilitates circulation and avoids condensation. The airangement of
the furnace secures a fine focusing effect, and carries the heating gases close to
the heating surfaces and in constant contact therewith. The furnace is con-
structed in separate sections that may be operated independently, which greatly
facilitates cleaning and repair, decreases the danger in case of accident and
insures the equal or desired distribution of the heating gases. The construction
of the division walls, which divide the furnace into separate compartments, of
water tubes or boxes, materially increases the heating surface for the generation
of steam. The arrangement of the baffles is such that they may readily be
changed or made to conform to the requirements of the peculiar character of
fuel employed, to secure its complete combustion within the furnace and the
utilization of a high degree of its energy in the generation of steam.
The principle and construction of my invention will more fully appear by
reference to the accompanying drawings, of which:
Figure 1 is a vertical sectional view on the line a-a of Fig. 2; Fig. 2 is a
vertical sectional view on the line b-b of Fig. 1; Fig. 3 is a vertical sectional
view on the line cc of Fig. 4; Fig. 4 is a vertical sectional view on the
line of Fig. 3, the tubes and bridge wall on the left being removed for the
purpose of illustration; Fig. 5 is a vertical sectional view at right angles to
the drums, in illustration of a modified form of the invention; Fig. 6 is a view of
a detail of the division walls.
In the construction, the steam-and-water drum 1 is connected with each of
the water drums 2, which may be of any of the forms shown, by the down-
comers 3 and the water circulating and steam generating tubes 4. Each of the
drums 2 is connected with a corresponding steam-and-water drum 1' by a bank
of water circulating and steam generating tubes 5 and by down-comers similar
to 3; and each of the drums 1' is connected with the drum - by tubes, as 6, 6¹,
and 6.
The feed water may be introduced by the pipes 13 placed in the water drums 2,
and baffled by the plates 13. Baffle plates 18 are placed in the drums 1 and 11

page_text: and plates 18 and dry pipe 19 are placed in the drum 1, to guard against
priming. The steam-and-water drums are provided with the take-off and escape
valve connections 20 and 201
The spaces between the drums 1 and 1' are closed by the dome or roof baffles 7,
placed above the tubes 6 and.composed of any suitable refractory material adapted
to insulate or confine the heated gases of combustion. Flame bridges or baffles 8,
made of any suitable refractory material and having their domes shaped as may
be found best adapted for the complete combustion of the fuel employed, are
placed between the banks of tubes 4 and 5 and, rise from the drums 2. The
interior of these bridges may be filled with material that can readily be removed
to permit access.. Baffles 9 extend downward from the drums 11 along the outer
tubes of the banks 5.
A division wall 10 (composed of refractory material, water tubes or boxes, or
a combination thereof) extends at right angles to the direction of the drums and
separates the furnace into two distinct compartments. A second division wall 22
(composed of refractory material, water tubes or boxes, or a combination thereof)
extends at right angles to the division wall 10 and may be employed to further
divide the furnace parallel to the bridges..
In the construction of these division walls, in the form of the invention illus-
trated in Fig. 1, a combination of refractory material and tubes 11, connecting
the water drums with the steam-and-water drums, are employed; but as illus-
trated in Figs. 3 and 4, the drums 1 and 1' may be connected with the drums 2
by water legs 11 and 11, and water boxes 10 and 1011 may be expanded into
these water legs at the angle desired, to form such division wall. As illustrated
in Figs. 5 and 6, the division wall 22 may be constructed of water tubes con-
necting the drum 1 with a drum 24, and the spaces between the tubes filled
with refractory tile 25. It will be understood that this division wall may be
formed of a single row of tubes.
The drums 2 rest on hollow supports 15 and the drum 24 rests upon the
hollow support 26, which serve with the doors 151 and the duct 26¹ to supply
air to the grates 14, and are especially useful in connection with forced draft.
These grates 14, extending between the drums 2, are provided with bridges 14'
for protecting the drums 2 and tubes 4 from burning out. Air ducts 27 are
formed in the containing walls 28 to supply air to the combustion chamber above
the grate surface. The walls 28 surrounding the boiler and furnace are pro-
vided with mauholes 29 and doors 30 to permit access. The drums 1 and 11 may be
supported by hangers 31; and it will be understood that the usual mechanical
devices, as the handhole caps for access to the tubes and the manholes for access
to the drums will be employed.
In the operation of the furnace, the gaseous products of combustion rise from
the main combustion chamber A, pass into the chamber B, and thence pass
downward along the outer bank of tubes, escaping by the passage C to the
breeching D, following the course of the arrows and imparting their energy to
the drums and tubes which are located in the direct path thereof. The heated
products of combustion are focused by the arrangement of the baffles and carried
close along the water circulating and steam generating system in constant con-
tact therewith. In the water circulating and steam generating system, the flow
is from the water drums 2 upward through the banks of tubes 4 and 5 to the
steam-and-water drums 1 and 1', within the furnace, thence back to the water
drums by the down-comers 3, without the furnace. The water and steam
circulates through this system with great facility, and as the heating surfaces
are arranged to receive the full energy of the gases the tendency to condensation
is minimized.

page_text: [Communicated from abroad by JOHN A. STEVENS, of 25, Dutton Street, in the
City of Lowell, State of Massachusetts, United States of America, Engineer.]
Improvements in Water-tube Steam Boilers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord
Street, Liverpool, and 6, Bank Street, Manchester, both in the County of Lan-
caster, and Lower Temple Street, Birmingham, in the County of Warwick, Civil
Engineer, do hereby declare the nature of this invention to be as follows;-
-
My invention is more particularly a water tube boiler and furnace therefor,
adapted for land and marine service. It is designed to obtain a compact system
of drums and tubes of large heating surface for the circulation of water and
the generation of steam, in combination, with a high degree of economy and
efficiency in handling the products of combustion. The arrangement of drums
and tubes facilitates circulation and avoids condensation. The arrangement of
the furnace secures a fine focusing effect, and carries the heating gases close to
the heating surfaces and in constant contact therewith. The furnace is con-
structed in separate sections that may be operated independently, which greatly
facilitates cleaning and repair, decreases the danger in case of accident and
insures the equal or desired distribution of the heating gases. The construction
of the division walls, which divide the furnace into separate compartments, of
water tubes or boxes, materially increases the heating surface for the generation
of steam. The arrangement of the baffles is such that they may readily be
changed or made to conform to the requirements of the peculiar character of
fuel employed, to secure its complete combustion within the furnace and the
utilization of a high degree of its energy in the generation of steam.
The principle and construction of my invention will more fully appear by
reference to the accompanying drawings, of which:
Figure 1 is a vertical sectional view on the line a-a of Fig. 2; Fig. 2 is a
vertical sectional view on the line bb of Fig. 1; Fig. 3 is a vertical sectional
view on the line cc of Fig. 4; Fig. 4 is a vertical sectional view on the
line d-d of Fig. 3, the tubes and bridge wall on the left being removed for the
purpose of illustration; Fig. 5 is a vertical sectional view at right angles to
the drums, in illustration of a modified form of the invention; Fig. 6 is a view of
a detail of the division walls.
In the construction, the steam-and-water drum 1 is connected with each of
the water drums 2, which may be of any of the forms shown, by the down-
Each of the
comers 3 and the water circulating and steam generating tubes 4.
drums 2 is connected with a corresponding steam-and-water drum 11 by a bank
of water circulating and steam generating tubes 5 and by down-comers similar
to 3; and each of the drums 11 is connected with the drum 1 by tubes, as 6, 6¹,
and 6.
The feed water may be introduced by the pipes 13 placed in the water drums 2,
and baffled by the plates 131. Baffle plates 18 are placed in the drums 1 and 11

page_text: and plates 18 and dry pipe 19 are placed in the drum 1, to guard against
priming. The steam-and-water drums are provided with the take-off and escape
valve connections 20 and 20¹.
The spaces between the drums 1 and 1' are closed by the dome or roof baffles 7,
placed above the tubes 6 and.composed of any suitable refractory material adapted
to insulate or confine the heated gases of combustion. Flame bridges or baffles S,
made of any suitable refractory material and having their domes shaped as may
be found best adapted for the complete combustion of the fuel employed, are
placed between the banks .of.tubes.4 and 5 and. rise from the drums 2. The
interior of these bridges may be filled with material that can readily be removed
to permit access.. Baffles 9 extend downward from the drums 11 along the outer
tubes of the banks 5.
A division wall 10 (composed of refractory material, water tubes or boxes, or
a combination thereof) extends at right angles to the direction of the drums and
separates the furnace into two distinct compartments. A second division wall 22
(composed of refractory material, water tubes or boxes, or a combination thereof)
extends at right angles to the division wall 10 and may be employed to further
divide the furnace parallel to the bridges...
In the construction of these division walls, in the form of the invention illus-
trated in Fig. 1, a combination of refractory material and tubes 11, connecting
the water drums with the steam-and-water drums, are employed; but as illus-
trated in Figs. 3 and 4, the drums 1 and 1' may be connected with the drums 2
by water legs 11 and 11, and water boxes 10 and 10 may be expanded into
these water legs at the angle desired, to form such division wall. As illustrated
in Figs. 5 and 6, the division wall 22 may be constructed of water tubes con-
necting the drum 1 with a drum 24, and the spaces between the tubes filled
with refractory tile 25. It will be understood that this division wall may be
formed of a single row of tubes.
The drums 2 rest on hollow supports 15 and the drum 24 rests upon the
hollow support 26, which serve with the doors 15 and the duct 26 to supply
air to the grates 14, and are especially useful in connection with forced draft.
These grates 14, extending between the drums 2, are provided with bridges 14'
for protecting the drums and tubes 4 from burning out. Air ducts 27 are
formed in the containing walls 28 to supply air to the combustion chamber above
the grate surface. The walls 28 surrounding the boiler and furnace are pro-
vided with manholes 29 and doors 30 to permit access. The drums 1 and 11 may be
supported by hangers 31; and it will be understood that the usual mechanical
devices, as the handhole caps for access to the tubes and the manholes for access
to the drums will be employed.
In the operation of the furnace, the gaseous products of combustion rise from
the main combustion chamber A, pass into the chamber B, and thence pass
downward along the outer bank of tubes, escaping by the passage C to the
breeching D, following the course of the arrows and imparting their energy to
the drums and tubes which are located in the direct path thereof. The heated
products of combustion are focused by the arrangement of the baffles and carried
close along the water circulating and steam generating system in constant con-
tact therewith. In the water circulating and steam generating system, the flow
is from the water drums 2 upward through the banks of tubes 4 and 5 to the
steam-and-water drums 1 and 1', within the furnace, thence back to the water
drums by the down-comers 3, without the furnace. The water and steam
circulates through this system with great facility, and as the heating surfaces
are arranged to receive the full energy of the gases the tendency to condensation
is minimized.

page_text: Improvements in Water-tube Steam Boilers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord
Street, Liverpool, and 6, Bank Street, Manchester, both in the County of Lan-
caster, and Lower Temple Street, Birmingham, in the County of Warwick, Civil
Engineer, do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:-
My invention is more particularly a water tube boiler and furnace therefor,
adapted for land and marine service. It is designed to obtain a compact system
of drums and tubes of large heating surface for the circulation of water and
the generation of steam, in combination with a high degree of economy and
efficiency in handling the products of combustion. The arrangement of drums
and tubes facilitates circulation and avoids condensation. The arrangement of
the furnace secures a fine focusing effect, and carries the heating gases close to
the heating surfaces and in constant contact therewith. The furnace is con-
structed in separate sections that may be operated independently, which greatly
facilitates cleaning and repair, decreases the danger in case of accident and
insures the equal or desired distribution of the heating gases. The construction
of the division walls, which divide the furnace into separate compartments, of
water tubes or boxes, materially increases the heating surface for the generation
of steam. The arrangement of the baffles is such that they may readily be
changed or made to conform to the requirements of the peculiar character of
fuel employed, to secure its complete combustion within the furnace and the
utilization of a high degree of its energy in the generation of steam.
The principle and construction of my invention will more fully appear by
reference to the drawings filed with my Provisional Specification of which:
Figure 1 is a vertical sectional view, on the line aa of Fig. 2; Fig. 2 is a
vertical sectional view, on the line of Fig. 1; Fig. 3 is a vertical sectional
view, on the line of Fig. 4; Fig. 4 is a vertical sectional view, on the
line of Fig. 3, the tubes and bridge wall on the left being removed for
the purpose of illustration; Fig. 5 is a vertical sectional view, at right angles
to the drums, in illustration of a modified form of the invention; Fig. 6 is a
view of a detail of the division walls.
In the construction, the steam-and-water drum 1 is connected with each of
the water drums 2, which may be of any of the forms shown, by the down-
comers 3 and the water circulating and steam generating tubes 4. Each of the
drums 2 is connected with a corresponding steam-and-water drum 11 by a bank
of water circulating and steam generating tubes 5 and by down-comers similar
to 3.and each of the drums 1 is connected with the drum 1 by tubes, as 6, 61
and 6
The feed water may be introduced by the pipes 13 placed in the water drums 2,
and baffled by the plates 131 (Figs. 2, 4 & 5). Baffle plates 18 are placed in
the drums 1 and 11, and plates 18 and dry pipe 19 are placed in the drum 1,
to guard against priming (Figs. 2 & 4). The steam-and-water drums are pro-
vided with the take-off and escape valve connections 20 and 201 (Figs. 1, & 3).
The spaces between the drums 1 and 1 are closed by the dome or roof baffles 7,
placed above the tubes 6 and composed of any suitable refractory material adapted
to insulate or confine the heated gases of combustion. Flame bridges or baffles 8,
made of any suitable refractory material and having their dome shaped as may
be found best adapted for the complete combustion of the fuel employed, are

page_text: placed between the banks of tubes 4 and 5, and rise from the drums 2 (Figs. 24
& 5). The interior of these bridges may be filled with material that can readily
be removed to permit access. Baffles 9 extend downward from the drums I¹
along the outer tubes of the banks 5 (Figs. 2 4 & 5).
A division wall 10 (composed of refractory material, water tubes or boxes, or
a combination thereof) extends at right angles to the direction of the drums
and separates the furnace into two distinct compartments, (Figs. 1 & 3). A
second division wall 22 (composed of refractory material, water tubes or boxes,
or a combination thereof) extends at right angles to the division wall 10 and
may be employed to further divide the furnace parallel to the bridges (see Fig. 5).
In the construction of these division walls, in the form of the invention illus-
trated in Fig. 1, a combination of refractory material and tubes 11, connecting
the water drums with the steam-and-water drums, are employed; but, as illus-
trated in Figs. 3 and 4, the drums 1 and 11 may be connected with the drums 2
by water legs 11 and 11, and water boxes 101 and 101 may be expanded into
these water legs at the angle desired, to form such division wall. As illustrated
in Figs. 5 and 6, the division wall 22 may be constructed of water tubes con-
necting the drum 1 with a drum 24, and the spaces between the tubes filled
with refractory tile 25. It will be understood that this division wall may be
formed of a single row of tubes 25.
The drums 2 rest on hollow supports 15 and the drum 24 rests upon the
hollow support 26, which serve with the doors 15¹ and the duct 261 to supply
air to the grates 14, and are especially useful in connection with forced draft.
These grates 14, extending between the drums 2, are provided with bridges 14'
for protecting the drums 2 and tubes 4 from burning out (Figs. 2 & 4). Air
ducts 27 are formed in the containing walls 28 to supply air to the combustion
chamber above the grate surface (Fig. 1). The walls 28 surrounding the boiler
and furnace are provided with man-holes 29 and doors 30 to permit access (Fig. 5).
The drums 1 and 11 may be supported by hangers 31, (Fig. 2) and it will be
understood that the usual mechanical devices as the hand-hole caps for access
to the tubes and the man-holes for access to the drums will be employed.
In the operation of the furnace, the gaseous products of combustion rise from
the main combustion chamber A, pass into the chamber B, and thence pass
downward along the outer banks of tubes, escaping by the passages C to the
breeching D, (Figs. 2 & 5) following the course of the arrows and imparting
their energy to the drums and tubes which are located in the direct path thereof.
The heated products of combustion are focused by the arrangement of the baffles
and carried close along the water circulating and steam generating system in
constant contact therewith. In the water circulating and steam generating
system, the flow is from the water drums 2 upward through the banks of tubes
and 5, to the steam-and-water drums 1 and 11, (Figs. 2 & 5) within the furnace,
thence back to the water drums by the down-comers 3, without the furnace
(Figs. 1 & 3). The water and steam circulates through this system with great
facility, and as the heating surfaces are arranged to receive the full energy of
the gases the tendency to condensation is minimized.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, as communicated
to me by my foreign correspondent, I declare that what I claim is:-
1. In the combination of a boiler and furnace, a combustion chamber, a water
drum, a steam-and-water drum, a bank of tubes connecting said drums, a second
steam-and-water drum, a bank of tubes connecting said water drum with said
second steam-and-water drum, a bridge wall between said banks of tubes, and a
baffle closing the space between said steam-and-water drums, substantially as
specified.
2. In the combination of a boiler and furnace, a combustion chamber, a water
drum, a steam-and-water drum, a bank of tubes connecting said drums, a second

page_text: steam-and-water drum, a bank of tubes connecting said water drum with said
second steam-and-water drum, one or more down-comers connecting said steam-
and-water drums with said water drum, tubes connecting said steam-and-water
drums, and a bridge wall between said banks of tubes, substantially as specified.
3. In the combination of a boiler and furnace, a combustion chamber, a pair
of steam-and-water drums, a bank of tubes extending from each of said steam-
and-water drums to a point of communication, a bridge wall between said banks
of tubes extending toward said steam-and-water drums, and a baffle extending
between said steam-and-water drums, substantially as specified.
4. In the combination of a boiler and furnace, a combustion chamber, a pair
of steam-and-water drums, a bank of tubes extending from each of said steam.
and-water drums, a water drum connecting said banks of tubes, one or more
down-comers connecting said steam-and-water drums with said water drum,
tubes connecting said steam-and-water drums, a bridge wall between said banks
of tubes, and a baffle extending between said steam-and-water drums.
5. In the combination of a boiler and furnace, a combustion chamber, a water
drum, a steam-and-water drum, a bank of tubes connecting said water drum with
said steam-and-water drum, one or more down-comers connecting said steam-
and-water drum with said water drum, a second steam-and-water drum, a bank
of tubes connecting said water drum with said second steam-and-water drum,
tubes connecting said steam-and-water drums, a roof baffle closing the space
between said steam-and-water drums, a bridge wall between said banks of tubes,
and a baffle for directing the heating gases downward along said second bank
of tubes, substantially as specified.
6. In the combination of a boiler and furnace, a pair of water drums, a
steam-and-water drum, a bank of tubes connecting each of said water drums with
said steam-and-water drum, a second bank of tubes leading from each of said
water drums,, a steam-and-water drum connected with each of said second banks
of tubes, a bridge wall between the banks of tubes connected with each water
drum, a combustion chamber, and means for directing the gaseous products of
combustion into contact with said tubes and drums, substantially as specified.
7. In the combination of a boiler and furnace, a pair of water drums, a steam-
and-water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a second bank of tubes leading from each of said water
drums, a steam-and-water drum connected with each of said second banks of
tubes, a bridge wall between the banks of tubes connected with each of said
water drums, tubes connecting said steam-and-water drums, and baffles closing
the spaces between said steam-and-water drums, substantially as specified.
8. In the combination of a boiler and furnace, a pair of water drums, a steam-
and-water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a second bank of tubes leading from each of said water
drums, a second steam-and-water drum connected with each of said water drums
by said second banks of tubes, a bridge wall between the banks of tubes connected
with each of said water drums and extending therefrom toward said steam-and-
water drums, baffles closing the spaces between said steam-and-water drums, a
combustion chamber between said bridge walls, and baffles for directing the
heating gases downward along said second banks of tubes, substantially as
specified.
9. In the combination of a boiler and furnace, a pair of water drums, a steam-
and-water drum, a bank of tubes connecting each of said water drums with
said steam-and-water drum, a second bank of tubes leading from each of said
water drums, a second steam-and-water drum connected with each of said water
drums by said second banks of tubes, down-comers connecting said steam-and-
water drums with said water drums, tubes connecting said steam-and-water
drums, a bridge wall between the banks of tubes connected with each water
drum, baffles closing the spaces between said steam-and-water drums, a com-

page_text: bustion chamber between said baffle walls, and baffles for directing the heating
gases downward along said second banks of tubes; substantially as specified.
10. In the combination of a boiler and furnace, a water drum, a steam-and-
water drum, a bank of tubes connecting said water drum with said steam-
and-water drum, a second steam-and-water drum, a bank of tubes connecting said
water drum with said second steam-and-water drum, a bridge wall between said
banks of tubes, a wall forming with said bridge wall a combustion chamber, and
means for directing the gases from said combustion chamber into contact with
said tubes and drums, substantially as' specified.
11. In the combination of a boiler and furnace, a water drum, a steam-and-
water drum, a bank of tubes connecting said water drum with said steam-
and-water drum, a second steam-and-water drum, a bank of tubes connecting said
water drum with said second steam-and-water drum, down-comers connecting
said water drum with one or more of said steam-and-water drums, tubes con-
necting said steam-and-water drums, a bridge wall between said banks of tubes,
a wall extending downward from one of said steam-and-water drums and form;
ing with said bridge wall a combustion chamber, and means for directing the gases
from said combustion chamber into contact with said tubes and drums,
substantially as specified.
12. In the combination of a boiler and furnace, a water drum, a steam-and-
water drum, a bank of tubes connecting said water drum with said steam-
and-water drum, a second steam-and-water drum, a bank of tubes connecting said
water drum with said second steam-and-water drum, a bridge wall between said
banks of tubes, a baffle extending between said steam-and-water drums, a wall
extending downward from one of said steam-and-water drums and forming with
said bridge wall a combustion chamber, a baffle extending downward from the
other of said steam-and-water drums and forming with said bridge wall an escape
pass, substantially as specified.
13. In the combination of a boiler and furnace, a water drum, a steam-and-
water drum, a bank of tubes connecting said water drum with said steam-
and-water drum, a second steam-and-water drum, a bank of tubes connecting said
water drum with said. second steam-and-water drum, down-comers connecting
said water drum with one of said steam-and-water drums, tubes connecting said
steam-and-water drums, a bridge wall between said banks of tubes, a baffle ex-
tending between said steam-and-water drums, a wall extending downward from
one of said steam-and-water drums and substantially parallel to said bridge wall,
a combustion chamber formed by said walls, a baffle extending downward from the
other of said steam-and-water drums and forming with said bridge wall an
escape pass, substantially as specified.
14. In the combination of a boiler and furnace, a water drum, a steam-and-
water drum, a bank of tubes connecting said water drum with said steam-
and-water drum, a second steam-and-water drum, a bank of tubes connecting said
water drum with said second steam-and-water drum, a bridge wall between said
banks of tubes, a wall substantially parallel with said bridge wall, a second
wall substantially at right angles to said bridge wall, said walls forming two
combustion chambers and means for directing the gases from said combustion
chambers into contact with said tubes and drums, substantially as specified.
15. In the combination of a boiler and furnace, a water drum, a steam-and-
water drum, a bank of tubes connecting said, water drum with said steam-
and-water drum, a second steam-and-water drum, a bank of tubes connecting said
water drum with said second steam-and-water drum, down-comers connecting
said steam-and-water drums with said water drum, tubes connecting said steam-
and-water drums, a bridge wall between said banks of tubes, a baffle extending
between said steam-and-water drums, a wall containing water passages extending
downward from one of said steam-and-water drums and substantially parallel to
said bridge wall, a second wall containing water passages extending substantially

page_text: at right angles to said bridge wall, said walls forming two combustion chambers,
and a baffle extending downward from the other of said steam-and-water drums,
substantially as specified.
16. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a second bank of tubes leading from each of said water
drums, a second steam-and-water drum connected with each of said water drums
by said second banks of tubes, a bridge wall between the banks of tubes con-
nected with each of said water drums, a division wall which separates the furnace
into two distinct compartments, and means for directing the gaseous products
of combustion into contact with said tubes and drums, substantially as specified.
17. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drúm, a second bank of tubes leading from each of said water
drums, a second steam-and-water drum connected with each of said water
drums by said second banks of tubes, down-comers connecting said water drums
with said steam-and-water drums, tubes connecting said steam-and-water drums,
baffles extending between said steam-and-water drums, a bridge wall between the
banks of tubes connected with each of said water drums, and a division wall
substantially parallel to the direction of said bridge walls, substantially as
specified.
'
18. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a second steam-and-water drum and a bank. of tubes
therefor connected with each of said water drums, down-comers connecting said
water drums with said steam-and-water drums, tubes connecting said steam-and-
water drums, baffles extending between said steam-and-water drums, a bridge
wall between the banks of tubes connected with each of said water drums, and
a division wall substantially at right angles to the direction of said bridge walls,
substantially as specified.
19. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a second bank of tubes leading from each water drum,
a second steam-and-water drum connected with each of said water drums by said
second banks of tubes, tubes connecting said steam-and-water drums, down-
comers connecting said steam-and-water drums with said water drums, baffles
extending between said steam-and-water drums, a bridge wall between the banks
of tubes connected with each of said water drums, a division wall substantially
parallel to the direction of said bridge walls, and a division wall substantially
at right angles to the direction of said bridge walls, substantially as specified.
20. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a second bank of tubes leading from each of said water
drums, a second steam-and-water drum connected with each of said water
drums by said second banks of tubes, tubes connecting said steam-and-water drums
down-comers connecting said steam-and-water drums with said water drums,
baffles extending between said steam-and-water drums, bridge walls between the
banks of tubes connected with the respective water drums, a division wall com-
prising water passages, substantially parallel to the direction of said bridge walls,
a division wall comprising water passages substantially at right angles to the
direction of said bridge walls, and baffles extending downward from said second
steam-and-water drums, substantially as specified.
21. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a baffle extending from each of said water drums toward
said steam-and-water drum, and an escape passage between said steam-and-water
drum and each of said baffles, substantially as specified.

page_text: 22. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a bridge wall extending from each of said water drums
toward said steam-and-water drum, a division wall forming with said bridge
walls two distinct combustion chambers, and an escape from each of said com-
bustion chambers between said steam-and-water drum and the respective bridge
walls, substantially as specified.
23. In the combination of a boiler and furnace, a pair of water drums, a steam-
and-water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drums, a bridge wall extending from each of said water drums
toward said steam-and-water drum, down-comers connecting said steam-and-
water drum with said water drums, escape passages between said steam-and-water
drum and each of said bridge walls, and a division wall comprising water passages
substantially at right angles to said bridge walls, substantially as specified.
24. In the combination of a boiler and furnace, a pair of water drums, a steam-and-
water drum, a bank of tubes connecting each of said water drums with said
steam-and-water drum, a bridge wall extending from each of said water drums
toward said steam-and-water drum, a division wall substantially at right angles to
the direction of said bridge walls, and a division wall substantially parallel to
the direction of said bridge walls, substantially as specified.
1000
1741CAT
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C.,
Patent Agents for the Applicant.
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C.,
Patent Agents for the Applicant.

page_text: 23
10
23
2