Improvements in Boiler and other Furnaces.
Year: 1894

page_text: Date of Application, 28th' Nov., 1894
Complete Specification Left, 27th Aug., 1895-Accepted, 12th Oct., 1895.
PROVISIONAL SPECIFICATION..
Improvements in Boiler and other Furnaces.
I, JOHN WARK ROBERTSON, of Georgefield, Uddingston, in the County of
Lanark, Coal Merchant, do hereby declare the nature of this invention to be as
follows:-
'This invention which relates to boiler and other furnaces has for its object the
provision of improved means for admitting heated air to effect more complete
combustion of the fire gases arising from the fire grate or furnace and thus prevent
the emission of smoke.
To that end 'I form an air chamber under or within the usual fire bridge or
nake the latter hollow, and projecting vertically, upwards-therefrom in the passage
between it and the crown of the furnace I fit a series of tubes composed of fire
clay, metal or other material which communicate with the air chamber. Over
the upper ends of these tubes an arch of fire brick or like material is or may be
built against the crown of the furnace or flue. Air led through the ash box or
under the firegrate or furnace and highly heated in its passage through the air
chamber is discharged by orifices or perforations in the sides and upper ends of
the tubes so as to meet the fire gases in their passage over the bridge and effect
their combustion.
Dated this 27th day of November 1894.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Boiler and other Furnaces.
1, JOHN WARK ROBERTSON, of Georgefield, Uddingston, in the County of
Lanark, Coal Merchant, 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 :-
This invention, which relates to boiler and other furnaces, has for its object the
provision of improved means for admitting heated air to effect more complete
combustion of the fire gases arising from the fire grate or furnace and thus prevent
the emission of smoke.
As represented in the accompanying drawings, which represent the furnace end
of a steam boiler in transverse vertical section at Figure 1 on the line A-B,
Figure 2, and in longitudinal vertical section at Figure 2, I form an air chamber A
under or within the usual fire bridge B, or make the latter hollow, and projecting
vertically upwards therefrom in the passage between it and the crown C of the
furnace I fit a series of tubes D composed of fire clay, metal or other material
which communicate with the air chamber A. Air led through the ash box E or
under the fire grate or furnace F, or by forced draught from behind, and highly
heated in its passage through the air chamber A is discharged by orifices or
Price 8d.l

page_text: perforations d in the sides and upper ends of the tubes D so as to meet the fire
gases in their passage over the bridge and effect their combustion. As shewn the
air chamber A and tube D may be conveniently formed in a single piece adapted
to be fitted in the boiler flue and constitute the bridge.
Over the upper ends of these tubes an arch of fire brick or like material may
be built against the crown of the furnace or flue to protect it from the direct
action of the hot gases.
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 :-
:-
In a boiler or other furnace a hollow bridge serving as an air chamber formed
or fitted with perforated tubes projecting upwards into the flue space and adapted
to discharge heated air so as to meet the fire gases in their passage over the bridge
substantially as described.
Amount 1905
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.