An Improved Combined Electric Light and Heat Stove.
Year: 1893

page_text: Date of Application, 31st May, 1893
Complete Specification Left, 28th Feb., 1894-Accepted, 21st Apr., 1894
PROVISIONAL SPECIFICATION.
An Improved Combined Electric Light and Heat Stove.
I, GEORGE MITCHELL of 47, Victoria Street Westminster Engineer do hereby
declare the nature of this invention to be as follows:-
My invention relates to combining lighting and heating by electricity or heating
economically by the same means and has for its object the utilizing of the heat
produced by electricity when yielding light.
To carry my invention into effect and by way of illustration I may use a form of
the incandescent or other electric light lamp as now in general use and understood.
One or more of these I enclose in a glass case preferably cylindrical in form and
from the top of which issues one or a series of circulating tubes rising parallel with
each other above the case to a suitable height when the tube or tubes turn over to
the outer side in half circular form and is or are continued downwards past the
case in which the incandescent or other lamp is enclosed the tube or tubes end in
the bottom sole plate which made hollow and are secured watertight by means of
glands or such convenient arrangement or the tubes may return corresponding in
design to the top, on the centre of the sole plate is a tube of an area which may be
greater than the sum of the others used in the arrangement and which tube is in
connection and common with the sole plate and case containing the incandescent or
other lamp.
Leading up vertically from the centre of the top of the lamp case I have a tube
carried to a greater height than the top bend on the circulating tubes and which
may remain open to the atmosphere.
On the highest point of the circulating tubes a plug or valve is arranged to allow
the air to escape when the tubes are being charged with water.
The arrangement of cylindrical lamp case in the centre, the circulating tubes,
sole plate, and return stand pipe, all being in common are now filled with pure
water or other liquid.
Electricity is now applied through the incandescent or other lamp as required to
yield light and heat.
The heat is taken up by the liquid contained in the cylindrical case and
surrounding the lamp, and on the established principle of the circulation of heated
fluids rises to the higher level up the circulating tubes and returns over the bend
and down through the vertical portion of the pipe into the sole plate yielding its
heat by conduction to the atmosphere and returns again cooled through the
vertical stand pipe into the cylindrical lamp case and the circulation is thus
continued the arrangement yielding both light and an economical increase of heat.
The heat can be regulated by means of a valve or suitable arrangement to check
the circulation.
The case containing the electric lamp may be surrounded by or made of a series
of prisms or of such form as to greatly increase or shield the light.
Dated this 30th dox of Max 1893

page_text: An Improved Combined Electric Light and Heat Stove.
I, GEORGE MITCHELL of 47, Victoria Street, Westminster, Engineer, 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:—
My invention relates to combining lighting and heating by electricity and has
for its object the utilising of the heat produced by electricity when yielding light.
And in order that my invention may be fully understood I will describe a simple
modification of same with accompanying drawing reference being had to the letters
and figures marked thereon.
Fig. 1. is a sectional elevation.
Fig. 2. is a full front elevation.
Fig. 3. is a plan.
To carry my invention into effect I may use a form of the incandescent or other
electric light lamp one or more of these as represented by a, a', in the accom-
panying drawing I enclose within glass tubes or cylinders b, b', which may be
connected in the manner shown to the circulating tubes c, c, rising to a suitable
height when they turn over in half circular form combining into one pipe d,
continued through the radiating plates e, and further by the bend f, which is one
with or mounted on the base or sole plate g, and also contains the packing glands
for the lamps and the lower ends of the tubes b, b².
On the highest point of the circulating tubes I place a glass sphere or cylinder h,
arranged with a plug or valve i, on the top which combination indicates when
sufficient liquid is in the circulating tubes allows for expansion and air in
consequence to escape.
The tubes and bends all being in common are now filled with a liquid prefer-
ably glycerine on account of its transparency and property of taking a high
temperature.
Electricity is now applied through the incandescent lamp as required to yield
light and heat.
The heat is taken up or absorbed by the glycerine or other liquid within the
cylindrical tubes b, b', and surrounding the lamps a, a', and on the established
principle of the circulation of heated fluids rises to the higher level up the
circulating tubes c, c, over the bend and down the return pipe d, through the
radiating plates e, yielding heat by conduction to the metal then returns cooled by
the lower bend pipe f, into the glass tubes b, b', again coming in contact with the
lamp to be reheated and circulation is thus continued yielding heat by conduction
through a large and suitable radiating surface with scarcely any perceptible
diminution of the light.
In the form of lamp used it is of advantage to have the filament or incandescent
conductor within the lamp as near the glass as possible and in practice it is found
convenient to use a tubular lamp of very small diameter with the terminals carried
through at either end.
The radiating surface may be made of any material having the best coefficients
of radiation and should be of such an area as will so rapidly diffuse the heat as to
prevent the material used exceeding a vapourising temperature sufficient to create
an excess of pressure within the tubes.
The glycerine or other liquid used may contain a small proportion of aniline or
other dye or colour so as to shade or tint the light as desired.

page_text: 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 [
claim is
First. The application of a liquid medium to absorb and convey heat produced
by an incandescent or other electric lamp when yielding light, to suitable radiators
substantially as hereinbefore described and illustrated in the accompanying
drawing.
Second. The construction and combination of parts for the purposes set forth
and hereinbefore described and illustrated in the accompanying drawing.
Dated this 28th day of February 1894.
GEO. MITCHELL,
47, Victoria Street, Westminster.