Year: 1887

page_text: Date of Application, 19th Nov., 1887
Specification Accepted, 20th Dec., 1887
A communication from JAMES SMITH, of 399, Richmond Street, Hotel Keeper, and
HARRY JAMES BOYD, of 196, Dundas Street, Manufacturer, both in the City of
London, County of Middlesex, and Province of Ontario, Dominion of Canada.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. 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 in gas stoves used for cooking and heating
purposes and it consists of improvements in the apparatus for rendering the flame
pure and smokeless and delivering it in that condition to a bed of lava or pumice
which acts as a spreader to the flame and attains a great heat, imparting it to the
cooking utensil or to the air accordingly as the stove is used for cooking or heating
purposes.
In the accompanying drawings:
1
Fig. 1 is a front elevation of a gas stove with this invention attached thereto.
Fig. 2 is a plan view on top showing the circular opening therein.
Fig. 3 is a plan view on top showing the basin attached below opening.
Fig. 4 is a plan view on top showing the box or basket filled with pumice.
Fig. 5 is a side view of tube enclosing burner.
Fig. 6 is a central vertical section of same.
A is the frame of a gas stove, of which B is the top plate and C the open space
therein through which the heat of the flame proceeding from the burner ascends.
D is the gas supply pipe and E the cock fitted with a burner h, all these parts being of
any ordinary or desired form of construction.
Fis a metal tube which is placed over the burner rising above it and descending
below it so as to enclose the burner in or near the centre of the opening C. This
tube is used to purify the flame of the gas burned inside it and to intensify the heat
by causing a current of air to draw up from beneath and surround the flame so that
Prine 6d 1

page_text: the whole of the carbon is rendered combustible producing a pure and smokeless
flame with intenser heat and economizing the quantity of gas consumed. The tube
is trumpet shaped as shown in drawings, and is open at top and bottom and through
its entire length. The broad lower end terminates in an expanding flange a
through which the external air enters from below and is fed to the flame of the gas
burner h. The small upper end of the tube terminates also in an expanding lip or
flange c and from this the flame issues and is distributed in a broad circular form.
The interior of the tube is shown fully in sectional view figure 6, d is a small ring
which fits over the burner and holds the tube in place; ee are rods which connect
this ring to the inside of the tube; is a larger ring attached to the outside of the
tube by rods 9 9. This ring rests upon the bottom of a metal basin G fitted below
the opening and forms a further support to the tube.
The upper rim of this metal basin G is attached to the opening C, beneath which it
is fixed so as to leave a space h for an air current between the two.
i is a circular opening in the bottom of the basin through which the burner passes
with its enclosing tube and this opening is made large enough to admit of the free
passage of air from below. The basin cuts off the cold air from the surface above it
and produces a draught through the opening i surrounding the burner and the tube.
Above the basin G and covering the opening C in top plate B is an iron box or
basket H open at top, closed at sides and having its bottom formed of cross bars or
perforated. This box or basket is filled with a bed of pumice or lava 1 which acts as
a spreader to the flame issuing from the tube F immediately beneath it and attains a
very high degree of heat from the action of the flame. It is so slow off combustion as to
be practically incombustible, soon becomes incandescent and retains its heat for a long
time after the flame is extinguished, the various portions of the broken pumice
radiating the heat from one to another. It is also of a naturally pure nature free
from all noxious fumes when heated, and makes the stove specially adapted for
cooking or warming purposes.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondents, and in what manner the same
is to be performed, I declare that what I claim is :-
1. In a gas stove a bed of lava or pumice placed immediately above the flame of
the gas burner so as to act as a spreader to the flame and receive and radiate the heat
thereof substantially as shown and specified.
2. In combination with the above described bed of lava or pumice I a metallic
basin G attached to the underside of top plate B of a gas stove and enclosing the open
space C beneath the said bed of lava or pumice so as to partially exclude the outer air
while admitting sufficient through opening i to supply the burner substantially as
shown and specified.
3. In combination with the burner of a gas stove an attachment for purifying the
flame by the more perfect combustion of the carbon consisting of a metal tube F
trumpet shaped as shown provided with expanding flanges or lips a c at bottom and
top and enclosing the burner and attached thereto by ring d and supported on outer
ring f substantially as shown and specified.
Dated this 15th day of November 1987