An Electro Magnetic Gas Controller.
Year: 1891

page_text: Date of Application, 22nd Apr., 1891
Complete Specification Left, 21st Jan., 1892-Accepted, 27th Feb., 1892
PROVISIONAL SPECIFICATION.
An Electro Magnetic Gas Controller.
JAMES MCLAREN Electrical Engineer Public Library Edinburgh do hereby
declare the nature of this invention to be as follows:-
To automatically control the flow of gas (or gas light) in a building which is lit
by electric light and especially such places as theatres where the accidental
stopping of the engines or dynamos from whatever cause, or the fussing of the main
cutout, may lead to considerable inconvenience or disastrous consequences, such as
a panic.
When the electric light goes out the controller opens the valve thereby allowing
the gas to flow to the different sun lights which have a pilot already burning or in
the case of ordinary burners a regulated peep from the controllers passby valve or
tap and thereby illuminate the building with gas until the electric light again
manifests itself. Then the controller reduces the gas to its former condition a
peep.
Fig. 1 is a vertical section and
Fig. 2 an end elevation of my invention.
Similar letters indicate like parts wherever shown.
(A) is the gas valve which is closed by the armature (B) attracted to the
electro-magnets (E) when the electric light is put on, when however the electric
current goes off, the spring (C) opens the valve (A) for the free passage of gas
to the different sunlights which have already a pilot burning, but in the case of
ordinary burners where there is no pilot pipe (F) is a passby tap to allow a small
quantity of gas to pass a sufficent supply for a peep of gas at each burner,
(D) are nuts or thumbscrews being adjustable so as to give a greater or less tension
to spring.
In opening the valve full open it would naturally make the gas burn too high
therefore (G) is a regulating set screw for the adjustment of the How of gas (H) is
a plug which is removed when the valve is to be ground or withdrawn (I) is
the direction of the flow of gas (J) attachment of frame to electro-magnets
(K) is port hole for passby valve (L) ends of insulated wire (M) soft iron core
(N) valve rod (O) stuffing box (P) fixture to frame for attachment of spring with
free hole to steady valve rod.
21st April 1891.
.
COMPLETE SPECIFICATION.
An Electro Magnetic Gas Controller.
JAMES MCLAREN Electrical Engineer Public Library Edinburgh 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:-
The above named instrument has been designed to automatically turn up the gas
light in any building where electric light is used, if at any time the electric light
should fail from whatever cause the gas light would immediately take its place and
thus avoid a panic or other inconvenience. The means taken to accomplish this
end are as follows. A valve is fixed in a convenient part of the gas service pipe.
The spindle which is fixed to the valve passed through a stuffing box where a small
iron armature is fixed to it, and on a small frame which connects the whole
D

page_text: instrument together two electro-magnets are held in position by two screws. When
the electric light is on a strong magnetism is produced in the cores of the electro-
magnets which immediately draws the armature towards them, the valve being
fixed to the same spindle is also drawn down and therefore closes the gas valve.
There is a passby valve arranged so that when the main valve is closed this 5
passby valve lets a sufficient quantity of gas pass to keep a peep in the burners
which are to be operated by the apparatus.
Fig. 2 is an end elevation drawing of my invention.
Similar letters indicate like parts wherever shown.
A is the gas valve, which is closed by the armature B being attracted to
the electro-magnets E, when the electric light is put on, when however the
electric current goes off the spring C opens the valve A for the free passage
of gas to the different sunlights which have already a pilot burning but in the
case of ordinary burners where the is no pilot pipe, F is a passby tap to allow
a small quantity of gas to pass a sufficient supply for a peep of gas at each
burner, D are nuts or thumbscrews being adjustable so as to give a greater or less
tension to spring, in opening the valve full open it would naturally make the gas
burn too high therefore G is a regulating set screw for the adjustment of the flow
of gas, H is a plug which is removed when the valve is to be ground or withdrawn
I is the direction of the flow of gas J attachment of frame to electro-magnets K is
port hole for passby valve, L ends of insulated wire, M soft iron core, N valve rod,
O stuffing box, P fixture to frame for attachment of spring with free hole to steady
valve rod.
I claim the whole of the apparatus or instrument as described, and illustrated in
the drawings filed with Provisional Specification.
Dated this 20th day of January 1809