Improvements in and relating to Arc Electric Lamps.
Year: 1894

page_text: Date of Application, 9th June, 1894
Complete Specification Left, 8th Mar., 1895-Accepted, 20th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in and relating to Arc Electric Lamps.
We, HENRY BEVIS, Electrician and HUGO HIRST Electrician both of 71 Queen
Victoria Street in the City and County of London, do hereby declare the nature
of this invention to be as follows:-
Our invention relates to certain improvements in, or appertaining to arc electric
lamps, and has for its object the concentration of the focus of light, and increasing
the illuminating power thereof.
In carrying our said invention into effect we employ a block or cube of lime,
marble, or any of the earths of which the base is preferably calcium, or other
refractory material, said block or tube being bored to receive the points of the
carbon or other electrodes, and also channelled or bored at right angles in order to
allow the divergence of the light rays. We may adapt this device to any kind of
focussing arc lamp and may support the block or cube by means of a holder or
holders, the free end or ends of which is or are arranged, to fit said block, and
attached at the opposite end to the frame of the lamp in such a manner as to permit
of easy adjustment. The block or cube may also be made in two or more parts,
these being held together by means of the holder or holders aforesaid.
The essential feature of our said invention is to enclose the arc within a block or
cube of lime, or like substance, so that the light rays are emitted from a suitable
orifice, and the substance or material being heated by the radiation of the arc,
increases the illuminating power thereof, and also neutralizes the color.
We do not confine ourselves to any particular type of automatic or hand operated
focussing lamp, nor to any special form of holder or holders therefor, but may
modify these to meet the requirements of special cases of application.
Data: 1 of 1001
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicants.
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicants.
HENRY BEVIS, Electrician, and HUGO HIRST, Electrician, both of 71 Queen
Victoria Street, City and County of London, 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 certain improvements in or appertaining to arc electric
lamps, and has for its object the concentration of the focus of light thus increasing
the illuminating power thereof.
In order that our said invention may be the better understood we have appended
the accompanying sheet of drawings in which
Figure 1 represents an ordinary hand feed focussing arc lamp,
Figure 2 a perspective view of the block herein after referred to, and Figure 3
a section thereof, both of these views being drawn to an enlarged scale, and
showing the part referred to detached.

page_text: In carrying our invention into effect we employ a block or cube A Figure 1, of
lime, marble, or any of the earths of which the base is calcium. Said block Á is
bored at a Figures 2 and 3 to receive the points of the carbon electrodes.
(B, B¹ Figure 1) and also channelled or bored at right angles, b (Figure 2 and 3)
and preferably tapered, in order to allow of the proper divergence of the light rays.
We may adapt this device to any known type of focussing lamp, whether provided
with band or automatic feeding apparatus, and in any case support said block A by
means of a holder D, which is shaped to suit the block, and provided with a clip,
clamp or other equivalent device for allowing it to be easily removed or replaced when
necessary, the opposite end of D being adapted to fit the frame or guide of the carbon
holders, with a screw or the like c to allow of free adjustment. The block or cube A
may be made solid as shown, or may be divided into two or more parts, these being
held together by the holder.
The essential feature of our said invention is to enclose the arc within a block or
cube of lime or like substance, so that the light rays are emitted from a suitable
orifice, and the substance or material of which said block or cube is composed,
becoming heated by the radiation from the arc, increases the illuminating power
thereof, and also neutralizes the colour.
Having now fully described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is ;
First. In an arc electric lamp, the use of and method of applying a block of
lime, marble or other like substance, A to surround the carbon electrodes B. B¹
of said lamp, substantially as and for the purposes herein set forth, and with
reference to the appended drawings.
Second. In an arc electric lamp the combination of a block of lime or other like
substance A with a holder D substantially as herein described.
FRED. WALKER,
73, St. Stephen's Road, Upton Park, E., Agent for the Applicants.