Year: 1888

page_text: Date of Application, 4th Feb., 1888
Complete Specification Left, 29th Oct., 1888
Complete Specification Accepted. 30th Nov., 1888
I, DAVID JUSTICE of 10 Bromley Hall Road, Poplar, in the County of Middlesex,
Marine Engineer, do hereby declare the nature of this invention to be as follows:-
I construct a steam boiler furnace with pipes rising up from the ash pit through
the bridge. At the top of the bridge I connect them to other pipes which rise
upwards and pass for a distance into the combustion chamber at the back and in the
upper portion which is within the combustion chamber I form perforations through
which air previously heated by its passage through the ash pit and through the pipes
themselves can pass to the gases coming from the furnace and complete their
combustion just as they pass into the return tubes or flues of the boiler.
The passage of air to the lower ends of the pipes I control by a valve or valves-
preferably make the pipes to enter a chamber shut off from the ash pit but with a
passage opening into it which is fitted with a valve that can be opened or closed by a
rod passing to the front of the furnace.
In the case of a furnace fired at both ends this chamber would be in a central
position between the ash pits of the two ends of the furnace and pipes would rise up
from it through the bridge into the central combustion chamber between two boilers."
The pipes which pass up through the bridge may be flanged at top and bottom-
the bottom flange may be bolted down to the bridge plate before the bridge is built
up around them and being protected by the bridge will last for a long time. The
upper flange may have pins standing up from it to pass through holes in a flange at
the bottom of the pipe which is to be connected to it-and slots may be formed
through the pins through which cotters may be driven to secure the upper pipe
when it has been put into place. In this way the upper pipes may readily be
removed for inspection or renewal whenever necessary.
Dated this 4th day of February 1888.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: 1. DAVID JUSTICE, of 10 Bromley Hall Road, Poplar in the County of Middlesex,
Marine 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 :-
I construct a steam boiler furnace with pipes rising up from the ash-pit through
the bridge. At the top of the bridge I connect them to other pipes which rise
upwards and pass for a distance into the combustion chamber at the back and in the
upper portion which is within the combustion chamber 1 form perforations through
which air previously heated by its passage through the ash-pit and through the pipes
themselves can pass to the gases coming from the furnace and complete their
combustion just as they pass into the return tubes or flues of the boiler.
The passage of air to the lower ends of the pipes I control by a valve or valves—
preferably I make the pipes to enter a chamber shut off from the ash-pit but with a
passage opening into it which is fitted with a valve that can be opened or closed by
a rod passing to the front of the furnace.
The
In the case of a furnace fired at both ends this chamber would be in a central
position between the ash pits of the two ends of the furnace and pipes would rise up
from it through the bridge into the central combustion chamber between two boilers.
The pipes which pass up through the bridge may be flanged at top and bottom-
the bottom flange may be bolted down to the bridge plate before the bridge is built
up around them and being protected by the bridge will last for a long time.
upper flange may have pins standing up from it to pass through holes in a flange at
the bottom of the pipe which is to be connected to it and slots may be formed
through the pins through which cotters may be driven to secure the upper pipe when
it has been put into place. In this way the upper pipes may readily be removed for
inspection or renewal whenever necessary.
Figures, 1 and 2 are longitudinal sections of steam boiler furnaces formed as above
described the furnace shewn at Figure 1 is constructed to be fired at both ends.
The furnace shewn at Figure -2 is constructed to be fired at one end only. Figure 3
is an end view of one of the fire places or furnace flues. Figure 4 is a vertical
section on a larger scale of one of the tubes for conveying air from the ash pit
through the bridge to the combustion chamber.
In figure 1A is the lower part of a steam boiler B an internal flue or fire place
fired at both ends-CC the ash pits below the two sets of fire bars.
D the bridge
between the two sets of bars-E an air chamber below the bridge to which air can
pass from both ash pits through openings F. G G are valves by which either one
or other of these openings can be closed. H H are pipes carried up from the air
chamber E through the bridge and terminating just level with it at the top. II are
pipes which can be readily connected to the ends of the pipes H or disconnected from
them. These pipes rise from the top of the bridge into the central combustion

page_text: KK are
chamber and are perforated at the top where they enter this chamber.
two sets of boiler tubes passing from the central combustion chamber to the two ends
of the boiler.
The way in which I prefer to connect the pipes I to the pipes H is clearly shewn
at figure 4. The pipes may be of a circular or oval form as may be desired.
.
In figure 2 the parts are marked with the same letters of reference as in figure 1.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. A steam boiler furnace with pipes rising up from the ash pit through the bridge
and passing upwards for a distance into the combustion chamber to supply air to the
gases from the fire just as they pass into the return tubes or flues.
2. Making the pipes which pass up through the bridge terminate at the level of
the top of the bridge and leading up from them other readily removable pipes to
supply heated air to the gases from the fire just as they pass into the return tubes
or flues.
3. The construction of steam boiler furnaces
described.
substantially as herein before