AND APPLICABLE TO DOMESTIC FIRE PLACES
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said James Smith at the Office
of the Commissioners of Patents on the 25th May 1882.
JAMES SMITH of Liverpool in the County of Lancaster, Baker,
IN AND APPLICABLE TO DOMESTIC FIRE PLACES
"
"IMPROVEMENTS
The main object of the said invention is to construct or adapt domestic or open
fire places to burn bituminous coal without the production of smoke and obtain the
maximum of heat for warming the room chamber apartment or other place with
the minimum, consumption of fuel.
Under the first part. Domestic fire places are constructed with a fire grate or
fuel basket in which the lower portion is surrounded or partly surrounded by a
coking chamber. A movable or sliding grate bottom, a closed ashpit, one or more
air supply ways or passages opening into the said ashpit and a controlling valve or
valves, damper or dampers.
When using the fire place the coking chamber is first filled with small coal slack
screenings or bituminous coal in like condition. The fire grate or basket is then
charged say with chips and anthracite coal or non smoke producing fuel and the
fire is lighted and replenished in the usual way. The speed of combustion is
regulated by controlling the air supply by means of the valve or valves, damper or
dampers and the ashes and remains of the burned fuel are caused to fall into the
ash pit by motion given to the movable or sliding bottom. The combustion of the
fuel in the grate or basket communicates heat to the coal in the coking chamber
and causes the gases and volatile matter therein to be distilled or pass off through
the incandescent fuel where they become ignited without the formation of smoke.
The coke formed in the coking chamber becomes the supply of fuel for the next

page_text: day's consumption in the fire grate or basket, rendering the use of anthracite or like
fuel unnecessary, and the said chamber is filled with a fresh quantity of coal to be
coked. The movable or sliding bottom facilitates the cleaning of the grate or
basket in the morning or before lighting the fire.
Under the second part the lower portion of the fire grate or basket of a domestic 5
fire place is entirely surrounded with a coking chamber.
1
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Smith in the Great Seal Patent Office on the
21st November 1882.
JAMES SMITH of Liverpool in the County of Lancaster, Baker, "IMPROVEMENTS
IN AND APPLICABLE TO DOMESTIC FIRE PLACES
"
The main object of the said invention is to construct or adapt domestic or open
fire places to burn bituminous coal without the production of smoke and obtain the
maximum of heat for warming the room chamber apartment or other place with
the minimum consumption of fuel.
Under the first part. Domestic fire places are constructed with a fire grate or
fuel basket in which the lower portion is surrounded or partly surrounded by a
coking chamber, in combination with a movable or sliding grate bottom, a closed
ash pit, one or more air supply ways or passages opening into the said ash pit and
à controlling valve or valves damper or dampers.
Fig 1 is a front view, fig 2 a horizontal section, and fig 3 a vertical section of a
domestic fire place constructed under the first part of my invention, a is the fire
grate or fuel basket, 6 coking chamber, c sliding grate bottom, & ashpit, closed
by means of the door e, f air supply ways to the ash pit and air chamber g,
h controlling valves or dampers.
When using the fire place the coking chamber bis first filled with small coal
slack screenings or coal in any like condition, the fire grate or basket a is then
charged say with chips and anthracite coal or non smoke producing fuel and the
fire is lighted and replenished in the usual way the speed of combustion is regulated
by controlling the air supply by means of the valves or dampers h, or it may be
controlled by the sliding bottom c instead of having a closed ashpit with dampers.
The combustion of the fuel in the grate or basket a communicates heat to the coal
in the coking chamber and causes the gases and volatile matter therein to be
distilled and pass off through the incandescent fuel where they become ignited
without the formation of smoke. The passage of heated air through openings in
the chamber g assists in promoting complete combustion of the gases and volatile
matter. The ashes and remains of burned fuel are removed from time to time by
giving motion to the sliding bottom c. The coke formed in the coking chamber
becomes the supply for the next day's consumption.

page_text: It will be obvious that the size and position of the coking chamber may be
considerably altered without departing from my invention.
Under the second part. The lower portion of the fire grate or basket of a
domestic fire place is entirely surrounded with a coking chamber.
The above second part of my invention will be readily understood on reference
to fig 2, the fire grate or basket a being in this case in the centre of the coking
chamber b.
Having now described the nature of the said invention in such manner that
others will be enabled to carry my improvements into effect, I claim :-
First. The combination of fire grate or basket; coking chamber, sliding bottom,
ash pit air ways and valves or dampers, substantially as set forth under the first
part.
Second. The domestic fire place substantially as set forth under the second part.
In witness whereof I the said James Smith have hereunto set my hand and
seal this eighth day of November in the year of Our Lord, one thousand,
eight hundred and eighty two.
JAMES JOHNSON
4 Clayton Square Witness
Liverpool
JAMES SMITH (L.S.)