Year: 1888

page_text: Date of Application, 8th Feb., 1888
Complete Specification Left, 3rd Nov., 1888
Complete Specification Accepted, 7th Dec., 1888
I, JAMES BEVERIDGE of the Soho Foundry, Barrow in Furness in the County
of Lancaster, Engineor do hereby declare the nature of this invention to be as
follows:-
"1
" hollow
Furnace Bars such as are known in practice as
bars are preferably used
but with the altoration hereinafter mentioned or pipes may be used for the purpose of
obtaining the hot air and increasing its intensity by passing through a chamber or
chambers placed in such a position as to allow the air after passing through the chamber
or chambers to combine with the gases from the fire.
My invention consists in the mode of conducting and forcing the air through the
bars or pipes and in the formation and fixture of a special chamber or chambers such
chamber or chambers being constructed and placed in the most advantageous manner
for the particular class of furnace required.
In the Locomotive or semi-portable type of Furnaces the chamber or chambers
are placed inside the firebox on the side the fire door is situate and are carried from
the top of the bars (where they may rest on a channel plate or other convenient base)
to a short distance below the level of the fire door and may when preferred be carried
along the two longitudinal sides and end of the firebox. The chamber or chambers
are made of fire-brick material metal or metal coated with any fire resisting medium
for greater durability.
Such chamber or chambers are placed over apertures in the bars or pipes and have
apertures carried to near the top of the chamber or chambers or it may be checkered
work inside passages being left open near the top of the chamber or chambers
towards the fire for the purpose of emitting the air after it has passed through the bars
or pipes and up the chamber or chambers and being heated during its passage is
impinged on the arch or it may be checkered work above the arch from the tube plate
and there combines with the gases thereby giving more perfect combustion.
The only alteration required from the ordinary type of hollow bars when used for
furnaces in Locomotives and all others of similar class, is that instead of the apertures

page_text: being carried straight through the bars or pipes at the ends where the chamber or
chambers rost the apertures are curved upwards to enable the current of air to pass
into the chamber or chambers.
The principle of the invention is as follows:-The apertures in the bars or pipes
being open at the one end of the firebox cause currents of air to travel through the
bars or pipes and up the chamber or chambers being ejected in hot streams over the
fire against the arch or checkered work above the arch where the air assimilates with
the gases.
In Locomotives the current of air required for combustion may be checked by a
damper as required in case of increase or decrease of speed or load or an increased
current of air may be circulated through the bars if required by the adoption of a
fan or pump for such purpose.
Data L
1000
improvements in Furnaces for Alding Combustion.
1, JAMES BEVERIDGE of the Soho Foundry, Barrow-in-Furness in the County of
Lancaster, 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 :-
Furnace bars, such as are known in practice as "hollow" bars are preferably used
but with the alteration hereinafter mentioned, or pipes may be used for the purpose
of obtaining the hot air, and increasing its intensity by passing through a chamber
or chambors placed in such a position, as to allow the air, after passing through the
chamber or chambers to combine with the gases of the fire.
My invention consists in the mode of conducting and forcing the air through the
bars or pipes, and in the formation and fixture of a special chamber or chambers. such
chamber or chambers being constructed and placed in the most advantageous manner
for the particular class of furnace required.
In the locomotive or semi-portable type of furnaces, the chamber or chambers are
placed inside the firebox, on the side the fire door is situate, and are carried from the
top of the bars (where they may rost on a channel plato or other convenient base) to
a short distance below the level of the fire door and may, when preferred, be carried
along the two longitudinal sides and end of the firebox. The chamber or chambers
are made of firebrick matorial, metal.or metal coated with any fire-resisting medium
for greater durability.

page_text: apertures carried to near the top of the chamber or chambers or it may be checkered
work inside passages being left open near the top of the chamber or chambers towards
the fire for the purpose of emitting the air after it has passed through the bars or
pipes and up
the chamber or chambers and being heated during its passage is impinged
on the arch, or it may be checkered work above. the arch from the tube plate
and there combines with the gases, thereby giving more perfect combustion.
The only alteration required from the ordinary type of hollow bars when used for
furnaces in locomotives and all others of similar class is that instead of the apertures
being carried straight through the bars or pipes at the ends where the chamber or
chambers rest the apertures are curved upwards to enable the current of air to pass
into the chamber or chambers.
The principle of the invention is as follows:-
The apertures in the bars or pipes being open at the one end of the firebox cause
currents of air to travel through the bars or pipes and up the chamber or chambers,
being ejected in hot streams over the fire against the arch or checkered work above
the arch where the air assimilates with the gases.
In locomotives the current of air required for combustion may be checked by a
damper as required in case of increase or decrease of speed or load or an increased
current of air may be circulated through the bars if required by the adoption of a fan
or pump for such purpose.
And in order that my invention may be more fully understood and carried into
practico, I will now proceed to describe the samo with reference to the accompanying
drawings, in which similar letters indicate corresponding parts throughout.
Fig. 1 is a sectional plan of part of a furnace constructed according to my invention
for land marine or similar boiler and other furnaces.
Figure 2 is a section on the line G. H. (Figure 1).
Figure 3 is a section on the line E, F. (Figure 1).
Figure 4 is a section on the line J. K. (Figure 3).
Figure 5 is a sectional plan shewing my invention as applied to a locomotive or
semi-portable type of furnace.
Figure 6 is a section on the line A. B. (Figure 5).
Referring to Figures 1 to 4 with a natural draught the front of the furnace is made
with a dead plate or with a hollow box a into which the air passes in the ordinary
manner. When a forced draught is used the air is forced through the branch or
nozzle into the hollow box a. The natural or forced draught is regulated by means
of the handle or rod i which opens or closes the grating or flap in which are one or
more rows of holes or slots g see Figure 2. The air travels through the hollow firo
bars or pipes b which open into a chamber or chambers c at the back of the bridge.
In its passage the air becomes heated, and passes into the chamber or chambers a
issuing therefrom through holes or perforations so formed in the back of the said
chamber or chambers c as to cause the heated air to travel in an upward direction
as indicated by the arrows in Figure 3. On its issue the air becomes intimately
mixed with the gases given off by the combustion of the fuel, and then passes through
the checkered or regenerative passages d built in the back of the furnace just behind
the chamber or chambers c. In Figure 3 one set of those regenerative passages dis
shewn which may fill the flue or two or more sets may be placed at intervals in the
flue, or in the most advantageous manner for the particular class of furnace as required.
In passing through the regenerative passages d the mixed gases are ignited and the
flames are led by a return flue or otherwise to any spot where their heat may best be.
utilized.
In addition to the chamber or chambers c behind the bridge a similar chamber or
chambers may if desired be placed above the dead plate or hollow box a and made to
open thereinto.
In the locomotive or semi-portable type of furnace as shewn in Figures 5 and 6 the
chamber or chambers c are placed within the firebox under the fire door, the ends of
the hollow bars or pipes b boing turned up so as to open into the bottom of the said

page_text: chambers c. On its issue from the chamber or chambers c the heated air is so
directed as to impinge against the arch d' or the checkered or regenerative passages
above the arch.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 wish it to be understood
that 1 make no claim to the use of hollow fire bars or pipes for the purpose of
assisting combustion in a furnace nor do I claim the use of regenerative passages, as
both these uses are well known, but I declare that what I do claim is :-
(1st.) In combination with the hollow fire bars, or pipes and regenerative
passages the perforated chamber or chambers e so constructed and placed as to
intimately mix heated air with the products of combustion from the furnace the said
heated air having been previously passed by a forced or natural draught through the
hollow fire bars or pipes 6 substantially as and for the purpose hereinbefore set forth
and illustrated in the accompanying drawings.
(2nd.) The perforated chamber or chambers c into which heated air is passed in any
convenient manner, so constructed and placed as to intimately mix the said heated air
with the products of combustion from a furnace substantially as and for the purpose
hereinbefore set forth.