A New or Improved Electrical Lamp.
Year: 1896

page_text: Date of Application, 25th Feb., 1896
Complete Specification Left, 23rd Oct., 1896-Accepted, 19th Dec., 1896
PROVISIONAL SPECIFICATION.
A New or Improved Electrical Lamp.
We, HERBERT JOHN DOWSING, of 35 Queen Victoria Street, in the City of
London, Electrical Engineer and HENRY SHEEHY KEATING, of Queen's Gate-
Mansions, Queen's Gate, Kensington, in the County of London, Barrister at Law,
do hereby declare the nature of this invention to be as follows:-
Our invention relates to an electrical lamp the light of which is produced by the
passage of high tension electrical currents through rarefied air or other suitable
gas or vapour. For this purpose, we employ a glass tube of very small bore into
the ends of which we seal leading in wires to terminals within the tube. We
exhaust the tube so as to produce a partial vacuum, and pass through it an electric
current preferably alternating.
In order to obtain a considerable area of luminosity, the tube may be bent into
a coil or like form, the convolutions of which being near together, present when
illuminated a considerable area of light. The interior of the tube may be
roughened by the action of fluoric acid.
We find it of advantage to put in the bulbs into which the terminals are sealed
a small quantity of mereury or of an amalgam of mercury with other metal.
. Dated this 25th day of February 1896.
ABEL & IMRAY,
Agents for the Applicants.
A New or Improved Electrical Lamp.
We, HERBERT JOHN DOWSING, of 35 Queen Victoria Street, in the City of
London, Electrical Engineer, and HENRY SHEEHY KEATING, of Queen's Gate
Mansions, Queen's Gate, Kensington, in the County of London, Barrister at Law,
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:-
Our invention relates to an electrical lamp the light of which is produced by the
passage of high tension electrical currents through rarefied air or other suitable
gas or vapour. For this purpose we employ a glass tube of very small bore such
as is used for thermometers into the ends of which we seal leading in wires to
terminals within the tube. We exhaust the tube so as to produce a partial
vacuum, and pass through it an electric current preferably alternating.
In order to obtain a considerable area of luminosity, the tube may be bent into
a coil or like form, the convolutions of which being near together, present when
illuminated a considerable area of light.

page_text: We find it of advantage to put. in the bulbs into which the terminals are sealed
a quantity of mercury or of an amalgam of mercury with other metal.
The accompanying drawings represent, by way of examples, various forms of
electrical lamps according to our invention.
In each case two bulbs B are connected by a small bore tube T which may be
bent and shaped in various ways.
Each bulb B contains mercury M lying on the end of a leading in wire W which
is sealed through the glass.
When currents of high tension are supplied, the interior of the glass tube
becomes highly illuminated. It is of advantage sometimes to warm the lamp
before starting so as to render the rarefied atmosphere within it more conductive
by the presence of a little mercury vapour.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner. the same is to be performed we declare that what we
claim is :-
An electric lamp consisting of a glass.tube of very small bore connecting two
bulbs containing mercury which are connected by leading in wires sealed through
the glass to a source of high tension electricity, the atmosphere within the tubes
and bulbs being rarefied.
Dated this 22nd day of October 1896
ABEL & IMRAY,
Agents for the Applicants.