An Improvement applicable to Locomotive and Marine Steam Engine Boilers.
Year: 1892

page_text: Date of Application, 23rd June, 1892
Complete Specification Left, 23rd Mar., 1893-Accepted, 29th Apr., 1893
PROVISIONAL SPECIFICATION.
An Improvement applicable to Locomotive and Marine Steam
Engine Boilers.
We JOHN LANGFIELD, Engineer and RICHARD BOARDMAN SHARPLES,
Manufacturer, both of 10 Exchange Buildings, Saint Mary's Gate, Manchester,
in the County of Lancaster, do hereby declare the nature of this invention to be as
follows:-
This invention is applicable to locomotive and marine steam engines, and the
principal objects thereof are to prevent smoke and to economize the fuel consumed
by utilizing the waste heat in the smoke box for the purpose of heating the air
supplied to the furnace instead of feeding the furnace with cold air through the
fire bars in the usual manner.
For the purposes of my invention I insert or apply inside the smoke box of the
locomotive or marine engine a chamber, cavity, or series of tubes, of an arched,
dome, or other convenient form, and I connect to the same a pipe or passage the
open end of which passes out through the front of the smoke box and is preferably
splayed out or trumpet mouthed, so that when the locomotive or marine engine is
in motion, a constant stream of cold air is thereby forced into the said chamber
cavity or tubes wherein it becomes immediately raised to a high temperature by
the flame and waste heat passing from the fire tubes through the fire box to the
chimney or smoke stack.
A passage, passages, or tubes lead from this air heating chamber or cavity into
the space below the fire bars of the furnace so that instead of the latter being
supplied with air at the temperature of the atmosphere as usual it is supplied with
air at a considerably higher temperature. If preferred this heated air may be fed
into any other suitable part or parts of the furnace, either instead of, or as well as,
under the fire bars.
By the use of this invention not only is all smoke consumed or prevented and
the combustion made much more perfect, but the fuel is greatly economized
as the waste heat is utilized and the draught of the chimney or smoke stack
greatly accelerated by the velocity of the current of air passed through the
furnace.
Dated this 2nd day of June 1899
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improvement applicable to Locomotive and Marine Steam
Engine Boilers.
We JOHN LANGFIELD Engineer, and RICHARD BOARDMAN SHARPLES,
Manufacturer, both of 10 Exchange Buildings Saint Mary's Gate Manchester, in
the County of Lancaster do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
This invention is applicable to locomotive and marine steam engines and the
principal objects thereof are to prevent smoke and to economize the fuel consumed,
by utilizing the waste heat in the smoke box for the purpose of heating the air
supplied to the furnace, instead of feeding the furnace with cold air through the
fire bars in the usual manner.

page_text: The nature of our said invention and the manner in which the same is to be per-
formed or carried into practical effect will be readily understood on reference to
the sheet of illustrative drawings hereunto annexed and the following explanation
thereof.
Fig. 1 is a transverse section through the smoke box of a locomotive engine
showing the application of my invention thereto, and Fig. 2 is a longitudinal
section of the firebox, smoke box, and part of the boiler.
Fig. 3 is a plan view of Fig. 1, Figs. 4, 5 and 6 are similar views of a modifica-
tion of the same.
For the purposes of our invention we insert or apply inside the smoke box a of
the engine (see Figs. 1, 2 and 3) a chamber b, or a cavity or series of tubes
of an arched, dome, or other convenient form and we connect to the same a
pipe or passage the open end of which passes out through the front of the
smoke box a and is preferably splayed out or trumpet mouthed so that when
the locomotive (or marine) engine is in motion a constant stream of cold air
is thereby forced into the said chamber (or into the cavity or tubes) wherein
it becomes immediately raised to a high temperature by the flame and waste heat
passing from the fire tubes d (Fig. 1) through the fire box a to the chimney for
to the smoke stack.
A passage e (or passages or tubes) leads from this air heating chamber or
cavity into the space y below the fire bars of the furnace see Fig. 2 so that
instead of the latter being supplied with air at the temperature of the atmosphere
as usual, it is supplied with air at a considerably higher temperature.
If preferred this heated air may be fed into any other suitable part, or parts, of
the furnace, for example as shown in the modification illustrated by Figs. 4, 5
and 6 either instead of, or as well as, under the fire bars.
By the use of this invention not only is all smoke effectually consumed or pre-
vented, and the combustion made much more perfect, but the fuel is greatly
economized as the waste heat is utilized, and the draught of the chimney or smoke
stack greatly accelerated by the velocity of the current of air passed through the
furnace and thus the pressure on the top of the chimney when running at high
speeds is greatly reduced.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is:-
The improvement applicable to locomotive and marine steam engine boilers con-
sisting in the combination with a chamber, cavity, or series of tubes, of an arched,
dome, or other convenient form placed in the smoke box, and having an open pipe
or passage extending through the front of the smoke box, of a second pipe or
passage leading from the said chamber, cavity, or series of tubes and conveying
the heated air therefrom into the furnace or into the ash-pit below the fire bars
substantially in the manner and for the purposes hereinbefore set forth and
illustrated by the drawings annexed.
Dated this 22nd day of March 1893
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.