IMPROVEMENTS IN BOILER FURNACES
Year: 1885

page_text: We, WILLIAM NOBLE of 24 High Street Sutton, in the County of Surrey Boiler
Setter and ANDREW MACKIE of 42 Cambridge Street Pimlico London in the
County of Middlesex Civil Engineer do hereby declare the nature of our invention
for IMPROVEMENTS IN BOILER FURNACES to be as follows:-
The object of this invention is to assist the combustion of the unconsumed gases
coal dust & in the fireboxes of boilers of the Locomotive type by introducing a
body of highly heated air into the upper part of the firebox and among the
products of combustion before they reach the tubes.
A curved or inclined arch or slab of firebrick or other refractory material is
constructed within the firebox in such a way that the lower end rests on the back
ends of the firebars next the tube plate, while the upper end of the arch or slab
terminates near the top and within a short distance of the stoking end of the
firebox.
This slab or arch is constructed with a number of air channels running through
its entire length from top to bottom.
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'
The air is drawn from beneath the firebars and through the said channels,
becoming highly heated in passing through them and is discharged into the 'furnace
at the upper end of the arch or slab.
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1
1.
Instead of the arch or slab resting directly on the firebars, a special perforated
cross girder or carrier for supporting the same can be used. '
!
WILLIAM NOBLE.
ANDREW MACKIE.

page_text: We, WILLIAM NOBLE of 24 High Street Sutton in the County of Surrey, Boiler
Setter and ANDREW MACKIE of 42 Cambridge Street Westminster in the County
of Middlesex, Civil Engineer do hereby declare the nature of our invention for
IMPROVEMENTS IN BOILER FURNACES and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
The object of this invention is to assist the combustion of the unconsumed gases,
coal dust & in the fireboxes of boilers of the Locomotive type by introducing a
body of highly heated air into the upper part of the firebox and among the
products of combustion before they reach the tubes.
A curved or inclined arch or slab "a" of firebrick or other refractory material is
constructed within the firebox in such a way that the lower end rests on the back
ends of the firebars next the tube plate, while the upper end of the arch or slab
terminates near the top and within a short distance of the stoking end of the
firebox. This slab or arch is constructed with a number of air channels "c"]
running through its entire length from top to bottom, the air is drawn from
beneath the firebars through the air channels becoming highly heated in passing
through them and is discharged into the furnace at the upper end of the arch
or slab.
Instead of the arch or slab resting directly on the firebars a perforated cross
girder or carrier for supporting the same can be used as shown at “b."
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 :-
.
i
1. The use of a slab or arch with a number of air channels formed therein as
described and shown on the drawing.