An Improved Furnace Bridge for Steam and other Boilers.
Year: 1889

page_text: Date of Application, 27th May, 1889
Complete Specification Left, 21st Feb., 1890-Accepted, 12th Apr., 1890
PROVISIONAL SPECIFICATION.
An Improved Furnace Bridge for Steam and other Boilers.
We, BANNISTER DARBYSHIRE of 77 Broughton Street, Halliwell, Bolton, Engineer,
and JOHN ENTWISTLE of 21 West Street, Sharples near Bolton, Clerk, both in the
County of Lancaster, do hereby declare the nature of our said invention to be as
follows:
This invention relates to an improved furnace bridge for steam and other boilers
employed for boiling, stoving, and drying and consists in constructing the saine in
sections of terra-cotta or other fire-resisting materials with an internal air chamber or
cavity. Each side of the bridge is provided with openings of any convenient form
for the passage of air to and from the internal chamber or cavity for the purpose of
reducing the temperature of the bridge below that of the fire, which is necessary to
minimise the destructive action of fire and the sticking of clinker. The upper portion
of each section is loose to allow of removal to clear the chamber or cavity of dust and
other imperfections carried and deposited therein by the action of the draught.
Dated the 24th May 1889.
EDMUND CHADWICK,
Agent
COMPLETE SPECIFICATION.
An Improved Furnace Bridge for Steam and other Bollers.
We, BANNISTER DARBYSHIRE of 77 Broughton Street, Halliwell, Bolton, Engineer,
and JOHN ENTWISTLE of 24 West Street, Sharples near Bolton, Clerk, both in the
County of Lancaster, do hereby declare the nature of our said invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
This invention relates to an improved furnace bridge for steam and other boilers
employed for boiling, stoving, and drying and consists in constructing the same in
sections of terra-cotta or other fire-resisting materials with an internal air chamber or
cavity. Each side of the bridge provided with openings of any convenient form
for the passage of air to and from the internal chamber or cavity for the purpose of
reducing the temperature of the bridge below that of the fire, which is necessary to
minimise the destructive action of fire and the sticking of clinker. The upper portion
of each section is loose to allow of removal to clear the chamber or cavity of dust and
other imperfections carried and deposited therein by the action of the draught.
Fig. 1 is a front elevation of our improved furnace bridge for steam and other
boilers Fig. 2 is a sectional elevation through line A' B' in Fig. 1-Fig. 3 is a front
elevation of another modification of our improved furnace bridge-Fig. 4 is a sectional
elevation through line C D' in Fig. 3, and Fig. 5 is a plan of Figs. 3 and 4.
This improved furnace bridge for steam and other boilers is composed of terra-
cotta, or other fire-resisting materials, and is constructed. in sections to facilitate
fixing and removal. The bottom piece or section A is laid on the bottom of the
boiler flue or furnace. On the piece or section A is mounted the section B provided
with the internal air chamber or cavity C. Each side of the section B is provided
with the openings D for the passage of air to and from the internal chamber or
cavity C for the purpose of reducing the temperature of the bridge below that of the
fire, and for supplying air to meet the gases passing over the bridge to aid combustion
and minimise the formation of smoke. The air chamber or cavity C is covered with
the loose piece or section E to allow of removal to clear the chamber or cavity C of
dust and other imperfections carried and deposited therein by the action of the

page_text: draught. If desired the openings D can be of the form shown in Figs. 3, 4, and 5;
the section E being provided with the holes D in lieu of those on the back side of the
sections B as shown in Fig. 2.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
Constructing furnace bridges for steam and other boilers of terra-cotta or other
fire-resisting materials in sections provided with the chamber or cavity and the
openings D substantially as described and as shown on the drawings for the purpose
specified.
Dated the 15th February 1800
EDMUND CHADWICK,
Agent.