IMPROVEMENTS IN BOILER RNACES THE SAME BEING ALSO APPLICABLE TO OTHER FURNACES
Year: 1884

page_text: I, HENRY THOMPSON, of No 29, Marquess Road, Canonbury, in the county
of Middlesex, Builder, do hereby declare the nature of the said Invention for
IMPROVEMENTS IN BOILER RNACES THE SAME BEING ALSO APPLICABLE TO
OTHER FURNACES," to be as follows:-
"
This invention relates to improvements in the construction of furnaces for
boilers which improvements are also applicable to other furnaces of similar
construction. The object of such improvements being to prevent, or nearly so,
the escape of smoke by the chimney. The said improvements are based upon the
inventions relating to domestic stoves and grates described in the specification of
Letters Patent granted to me and bearing date the 14th day of February 1883.
N° 812. and in the Provisional Specification lodged with an application for a
Patent by me at the Patent Office on the 1st day of January 1884. N° 144.
The front portion of the bottom of the furnace is hinged at the inner side, and
has a weighted prolongation, below such hinge, extending into the ash pit. The
fire bars are arranged between the said hinge and the back of the furnace. The
space immediately in front and above the said hinged portion of the bottom of the
furnace is closed by a door provided with a number of slots or apertures. In front
of the said door and at a short distance therefrom is hinged a second door the
space below which and in front of the ash pit is closed by a door which is provided
with a suitable apparatus for regulating the admission of air. In some cases a
suitable channel is arranged in, or below, the front of the bottom of the boiler for
the purpose of facilitating the examination of the interior of the furnace, this
channel may also, when desired, be constructed to admit of the entrance of a
regulated supply of air and also to allow of the passage of the poker or other
desired instrument.
I will now proceed to refer to the accompanying drawings from which the
nature of the said invention will be more clearly understood. Figure 1. is a front
elevation and Figure 2. a longitudinal section of a furnace constructed in accordance
with this invention. A. is the furnace, B. the boiler, and C. the flue or chimney.
The front portion D. of the bottom of the furnace is hinged at d. and it is
provided with a weighted prolongation D' which is below the hinge and is
situated within the ash pit E., F. are the fire bars, G is the inner door hereinbefore
[Price di

page_text: referred to, and H. is the outer door the space below which leading to the ash pit
is closed by the door I., J. is the space between the two doors G. and HL, and K. is
the channel at the lower part of the front of the boiler by means of which the
interior of the furnace may be inspected, and which may be provided with an air
inlot.
The action of furnaces constructed as herein before described is as follows. In
order to light the fire the doors are opened as shown in dotted lines and the plate D.
is brought into a horizontal position, a certain amount of wood and cinders or
other suitable material is then placed on the fire bars and a small quantity of coal
is deposited on the said plate D. the wood or other material is then ignited and the
doors are closed, the heat from the burning material will cause a certain amount of
gases and smoke to be thrown off by the coal and the said gases and smoko will
either pass directly over or into the said burning material or will escape through
the perforations in the door G. down through the space J. into the ash pit whenco
they will be drawn up through the fire bars into the burning material, in either
case the escape of the smoke up the chimney will be entirely or almost prevented.
As the fuel on the plate D. becomes coked more is added and when the whole of
the coal has been sufliciently heated it is carried forward on to the fire bars, from
time to time, by the plate D. turning upwards on its hinge, such novement of the
plate being effected by the weighted prolongation D¹ assisted, if desired, by any
other means as will be well understood. The slots or apertures in the door G. are
made of such a size as to allow of the free passage of a poker or other suitable
instrument so that the door H. having been opened the said instrument may be
inserted into the furnace and the fuel stirred.

page_text: I, HENRY THOMPSON, of N° 29, Marquess Road, Canonbury, in the County of
Middlesex, Builder, do heroby declare the nature of my invention for "IMPROVE-
MENTS IN BOILER FURNACES THE SAME BEING ALSO APPLICABLE TO OTHER
FURNACES," and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
My invention relates to improvements in the construction of furnaces for boilers
which improvements are also applicable to other furnaces of similar construction,
the object of such improvements being to prevent, or nearly so, the escape of sinoke
by the chimney. The said improvements are based upon the inventions relating to
domestic stoves and grates described in the Specifications of Letters Patent granted
to me and dated respectively the 14th day of February 1883. N° 812, and the
1st day of January 1884. No 144.
The front portion of the bottom or fire grate of the furnace is hinged at the
inner side, and has a weighted prolongation, below such hinge, extending into the
ash pit. The fire bars are arrangod between the said hinge and the back of the
furnace. The spaco immediately in front and above the said hinged portion of
the bottom of the furnace is closed by a door provided with a number of slots or
apertures. In front of the said door and at a short distance therefrom is hinged
a second door the space below which and in front of the ash pit is closed by a door
which is provided with a suitable apparatus for regulating the admission of air.
In some cases, a suitable channel is arranged in, or below the front of the bottom
of the boiler for the purpose of facilitating the examination of the interior of the
furnace, this channel may also, when desired, be constructed to admit of tho
entrance of a regulated supply of air, and also to allow of the passage of the poker,
or other desired instrument.
I will now proceed to refer to the drawings accompanying the Provisional
Specification of this application from which the nature of tho said invention will
be more clearly understood. Figure 1. is a front elevation, and Figure 2. a
longitudinal section of a furnace constructed in accordance with this invention.
A. is the furnace, B. the boiler, and C. the flue or chimney. The front portion D.
of the bottom or fire grate of the furnace is hinged at d. and it is provided with a
weighted prolongation D' which is below the hinge, and is situated within the ash
pit E. F. are the fire bars. G, is the inner door herein before referred to, and H. is
the outer door the space below which leading to the ash pit is closed by the door I.
J. is the space between the two doors G. and H. and K. is the channel at the lower
part of the front of the boiler by means of which the interior of the furnace may be
inspected, and which may be provided with an air inlet.
The action of furnaces constructed as herein before described is as follows. In
order to light the fire the doors are opened as shown in dotted lines and the plate D.
is brought into a horizontal position; a certain amount of wood and cinders or
other suitable material is then placed on the fire bars and a small quantity of coal
is deposited on the said plate D. the wood or other material is then ignited and the

page_text: doors are closed, the heat from the burning material will cause a certain amount of
gases and smoke to be thrown off by the coal and the said gases and smoke will
either pass directly over or into the said burning material or will escape through the
perforations in the door G down through the space J. into the ash pit whence they
will be drawn up through the fire bars into the burning material, in either case
the escape of the smoke up the chimney will be entirely or almost prevented. As
the fuel on the plate D. becomes coked more is added and when the whole of the coal
has been sufficiently heated it is carried forward on to the fire bars from time to
time, by the plate D. turning upwards on its hinge such movement of the plato
being effected by the weighted prolongation D¹ assisted, if desired, by any other
means, such as a lever, as will be well understood. The slots or apertures in the
door G. are made of such a size as to allow of the free passage of a poker or other
suitable instrument so that the door H. having been opened the said instrument
may be inserted into the furnace and the fuel stirred.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
First. The construction of the bottom or fire grate of furnaces with the hinged
front portion D. and the arrangement of the same in connection with the door G.
and space J., substantially as and for the purposes hereinbefore set forth and
described.
And Secondly. In the construction of furnaces, the combination and arrangement
of parts, substantially as and for the purposes herein before set forth and described.