Year: 1887

page_text: Date of Application, 13th Sept., 1887
Complete Specification Left, 12th July, 1888
Complete Specification Accepted, 24th Aug., 1888
FREDERICK CARRINGTON PHILLIPS of 2 Victoria Mansions Westminster in the
County of Middlesex Electrical Engineer & HUGH ERAT HARRISON of the same
address Electrical Engineer do hereby declare the nature of this invention to be as
follows:-
Our invention relates especially to focussing arc lamps but is equally applicable to
other forms, the following is a discription of our invention as employed in focussing
lamps that is lamps in which both the electrodes are moved so as to keep the position
of the arc approximately constant.
On a spindle are rigidly mounted two wheels to each of which there is attached a
cord or chain or a flexible equivalent hereinafter called the chain.
To the free end of one of the chains one of the electrodes is attached. To the free
end of the other chain the other electrode is attached.
The chains are so attached & arranged on the wheels, that the electrodes suspended
on the chains act to more or less counterbalance each other by this arrangement the
electrodes approach or recede from each other simultaneously & at a relative speed
depending on the relative diameters of the two wheels to which the chains are
attached.
At the periphery of one of the wheels is suitably placed a brake hereinafter called
the brake piece formed of suitable material with a notch in it made so that it will
go easily over the edge of the wheel & in such manner that when by means of the
suitable electromagnetic devices one side or end of this brake piece is lifted in a plane
approximately at right angles to the plane of the wheel so as to tilt it, it will grip the
wheel & in any further movement of the brake piece it & the wheels will move as
one about the common axis of the two wheels & thus move the electrodes apart to
form the arc, a reverse movement of the electromagnetic devices will ultimately allow
the brake piece to release its grip on its wheel & so allow the wheels to turn round
& the electrodes to approach each other.

page_text: It will be obvious that our invention is equally applicable to lamps in which one of
the electrodes is made stationary, and the counterpoise effect is then obtained by a
weight or coiled spring.
If a coiled spring were used one of the wheels would be done away with.
Dastal thin 12th down of
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1007
We, FREDERICK CARRINGTON PHILLIPS, of No. 2 Victoria Mansions, Westminster,
in the County of Middlesex, Electrical Engineer, and HUGH ERAT HARRISON, of same
address, Electrical 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 :-
Our invention relates especially to focussing arc lamps but is equally applicable to
other forms of are lamp. Our object is to so arrange the mechanism for establishing
and regulating the arc as to enable a short and compact lamp to be produced that
shall nevertheless be efficient in operation. The following is a description of our
invention as employed in focussing lamps, that is, lamps in which both the electrodes
are moved so as to keep the position of the arc approximately constant. On a spindle
are rigidly mounted two wheels to each of which there is attached a cord or chain or
a flexible equivalent such as a tape hereinafter called the chain. To the free end of
one of the chains one of the electrodes is attached. To the free end of the other chain
the other electrode is attached.
The chains are so attached and arranged on the wheels that the electrodes suspended
on the chains act to more or less counterbalance each other, by this arrangement the
electrodes approach or recede from each other simultaneously and at a relative speed
depending on the relative diameters of the two wheels to which the chains are
attached. At the periphery of one of the wheels is suitably placed a brake hereinafter
called the brake piece formed of suitable material (for example brass) with a notch in
it made so that it will go easily over the edge of the wheel and in such manner that
when by means of suitable electromagnetic devices one side or end of this brake piece
is lifted in a plane approximately at right angles to the plane of the wheel so as to tilt
it, it will grip the wheel and in any further movement of the brake piece it and the
wheels will move as one about the common axis of the two wheels and thus move the

page_text: electrodes apart to form the arc. A reverse movement of the electromagnetic devices
will ultimately allow the brake piece to release its grip on its wheel and so allow the
wheels to turn round and the electrodes to approach each other.
An arrangement according to our invention is illustrated diagrammatically in the
drawings annexed, Fig. 1 being a plan and Fig. 2 an elevation.
A and B are the electrodes C is a chain or equivalent carrying at one end the
electrode A and attached at its other end to the wheel D-E is another chain carrying
at one end the electrode B and attached at its other end to the wheel F.
The two wheels are mounted on a spindle not shown. When this spindle turns in
a rotary sense in one direction the electrodes will be caused to approach one another;
when the spindle turns the contrary way they will recede from one another.
G is a
brake piece with a notch G¹. This brake piece is freely supported and guided in any
convenient manner in the lamp frame so as to partially embrace a part of the larger
wheel as illustrated. H is a frame pivoted at I to an electromagnet K and provided
with a projection L. When the magnet is excited the frame H will be actuated,
thereby raising the projection L, which will be caused to lift one side of the brake
piece G thereby tilting it into an attitude in which it will grip the wheel, whereupon,
as already stated, in any further movement of the brake piece it and the wheels will
move as one about the common axis of the two wheels and thus move the electrodes
apart to form the arc. A reverse movement of the electromagnetic devices (and,
consequently, of the wheels and brake piece also) will ultimately allow the brake piece
to release its grip on its wheel and so allow the wheels to turn round and the
electrodes to approach each other.
It will be obvious that our invention is equally applicable to lamps in which one of
the electrodes is made stationary and the counterpoise effect is then obtained by a
weight or coiled spring. If a coiled spring were used one of the wheels would be
done away with.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
In an electric arc lamp the combination and arrangement of parts substantially as
described with reference to the drawings annexed for establishing and regulating the
arc, whether both electrodes or one of them only be moveable.
Doted this 10th dov of July, 1888
Deted this 19th day of Inly 1898
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.