Improvements in Furnaces for Preventing or Consuming Smoke therein.
Year: 1890

page_text: rate of Application, 3rd May, 1890
Complete Specification Left, 28th Jan., 1891-Accepted, 11th Apr., 1891
PROVISIONAL SPECIFICATION.
Improvements in Furnaces for Preventing or Consuming Smoke
therein.
We, JAMES ASHWORTH, of Dalton-in-Furness, in the County of Lancaster,
Gentleman, and WILLIAM KNEEN, of 149A, Aldersgate Street, in the City of
London, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements upon the invention for which Letters
Patent No. 7393 dated 17th June 1885 were granted to one of us viat. William
Kneen the object of the present invention being to so improve the arrangement
there described that the draught is not impeded and we can burn more fuel per
square foot of the fire grate than can be burned according to the aforesaid prior
arrangement.
According to the present invention the air is forced under pressure through a
pipe or passage or pipes or passages preferably situated in the ash-pit and into a
pipe or passage behind the bridge with outlet orifices presented away from the
bridge and so directed that the air from them, or from some of them, caused to
pass across the direction of the dranght of the furnace and to impinge with the
hot gases and smoke from the furnace upon blocks which are situated at the sides
of the combustion chamber at the rear of the bridge the space between these
blocks being left clear for the draught. The air may be forced into the aforesaid
pipe or pipes or passage or passages by means of a fan or any other suitable air
forcing device and the air pipes or passages may be led through the ash pit or
through other convenient part of or in proximity to, the furnace so as to become
heated thereby.
D:. 2.1 1... SW 1000
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, Agents.
COMPLETE SPECIFICATION.
Improvements in Furnaces for Preventing or Consuming Smoke
therein.
We, JAMES ASHWORTH, of Dalton-in-Furness, in the County of Lancaster,
Gentleman, and WILLIAM KNEEN, of 1494, Aldersgate Street, in the City of
London, Manufacturer, 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 relates to improvements upon the invention for which Letters
Patent No. 7393 dated 17th June 1885 were granted to one of us viz. :-William
Kneen, the object of the present invention being to so improve the arrangement
described in the Specification of the said Letters Patent that the draught is not
impeded and we can burn more fuel per square foot of the fire grate than can be
burned according to the aforesaid prior arrangement.
We will describe our present invention with reference to the accompanying
drawing
Figure 1 being a front elevation (not shewing however the bridge).
Figure 2 a sectional plan and

page_text: forcing device through pipes or passages A A preferably continued in the form of
n box A through the ash-pit and into a pipe or passage A behind the bridge B
with outlet orifices a a presented away from the bridge and so directed that the air
from them, or from some of them, is caused to pass across the direction of the
draught of the furnace as shewn by the arrows in Figure 2 piercing the products
of combustion from the fire and impinging in admixture with the said products
upon blocks or projections C. C. which are situated at the sides of the combustion
chamber at the rear of the bridge B2 the space at between these blocks being
left clear for the draught. The projections may be made of blocks or be
moulded in one or more pieces as desired and they may be made of fire-clay,
chrome-iron, or other material which will withstand the high temperature.
dis an arch-piece serving to support the projections ('.
We have shewn a boiler with two flues in Figure 1 but the invention is of course
not limited to a double-flued boiler. It is preferred that the air pipes or passages
be continued through the ash pit by a box-like conduit therein as shewn but the
air pipes or passages may be otherwise shaped and be led through other convenient
part of, or in proximity to, the furnace so as to become hoated thereby.
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
In furnaces a passage provided with an air forcing device and carried to behind
the bridge and terminating in a pipe or passage with perforations therein so
arranged as to direct the air neross the line of the draught and against blocks or
projections from the walls of the combustion chamber at each side arranged so as to
leave the space E between them substantially as and for the purposes hereinbefore
described.
Dated this 17th day of January 1891
JAMES ASHWORTH.
WILLIAM KNEEN.