Improvements in Arc Lamps with Hand Regulation.
Year: 1895

page_text: Date of Application, 7th June, 1895
Complete Specification Left, 7th Mar., 1896-Accepted, 2nd May, 1896
PROVISIONAL SPECIFICATION.
Improvements in Arc Lamps with Hand Regulation.
I, JULIUS PESCHEK of 42 Wellington Road, Charlton, S. E. in the County of
Kent, Electrical Engineer do hereby declare the nature of this invention to be
as follows:-
In arc lamps used for projection, when worked by a continuous current, it is
necessary, in order to place the are in the best position, in the focus of the mirror,
or system of lenses employed, to place the carbons in an inclined position, while if
an alternating current is employed, the vertical position is preferable. When a
continuous current is used, the positive carbon, generally placed uppermost, burns
about twice as fast as the negative, so that when for the sake of simplicity, the
lamp is arranged so that both carbons are fed at the same rate, the positive carbon
is approximately twice the area of the negative.
My invention relates to an arc lamp with equal feed, adjustable for either
current. One method is to make the upper or positive carbon holder of sufficient
size to take a carbon suitable for a continuous current, the carbon being held by a
screw, spring, or other suitable method. When it is necessary to use the lamp on
an alternating current, a sleeve is inserted in the carbon holder, of suitable size to
take a carbon, equal in area to the second or lower carbon. This sleeve is held in
position by the same spring, screw, or other arrangement which holds the larger
carbon suitable for use with a continuous current. The carbon may be held to the
sleeve by a second spring or screw, or by a ball or plunger upon which the spring
holding the sleeve also presses.
Another method is to have the upper carbon holder provided with two holes,
one suitable for the larger carbon used with continuous current, and the other for
the smaller carbon. In this case the carbon holder will be movable about a centre
screw fixed to the guide, so as to bring the upper carbon in line with the lower, the
carbon holder being held in the most suitable position by a set screw or other
arrangement.
The carbons may be held by a wedge pressed into a slot cut in the body of the
holder between the two holes, by a spring, or each carbon may be held by a ball,
of greater diameter than the thickness of the wall of the carbon holder, pressed
against it by a spring, the ball being prevented from falling out by a rim of metal
left at the bottom of the hole when drilling it. The hole is of just sufficient size
to allow the ball to move freely in it, or the carbons may be held by set screws, or
other suitable arrangement.
The upper and lower carbon holders are attached to the frame of the lamp by
guides, and actuated by a screw, rack & pinion, or other suitable arrangement.
The frame of the lamp is attached to the standard by a screw, bolt, or rivet, about
which it is movable. The lamp is held either in the vertical or inclined position
by a ball, pressed into one of two shallow holes, drilled in the body of the frame,
by a spring, so as to lock it in position, the ball bearing on the sides of the hole in
the standard, as well as on the sides of one of two shallow holes in the frame,
or by a spring screwed to the standard, pressing into one of two slots cut in a
quadrant attached to the frame. The spring and ball, or spring, may be fitted to
he frame, & the slots or holes made in the standard, or vice versa.
Dated this Seventh day of June 1895.

page_text: Improvements in Arc Lamps with Hand Regulation.
I, JULIUS PESCHEK, of 42 Wellington Road, Charlton S.E. in the County of
Kent 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 :-
In arc lamps used for projection when worked by a continuous current it is
necessary in order to place the arc in the best position, in the focus of the mirror
or system of lenses employed to place the carbons in an inclined position, while if
an alternating current is employed the vertical position is preferable. When a
continuous current is used the positive carbon, generally placed uppermost burns
about twice as fast as the negative, so that when for the sake of simplicity the
lamp is arranged so that both carbons are fed at the same rate, the positive carbon
is approximately twice the area of the negative. My invention relates to an arc
lamp with equal feed, adjustable for either current, and so that the same may be
readily understood I have attached hereunto a sheet of drawings in which Figure 1
shows the lamp as arranged for direct current and Figure 2 arranged for
alternating current.
Similar letters in the two figures refer to similar parts.
One method of carrying out my invention is to make the upper or positive
carbon holder of sufficient size to take a carbon D suitable for continuous current
as Figure 1, the carbon being held by a spring A, screw, or other suitable method.
When it is necessary to use the lamp on an alternating current, as Figure 2, a
sleeve B is inserted in the carbon holder C of suitable size to take a carbon D
equal in area to the second or lower carbon D₁. This sleeve B is held in position
by the same spring A, screw or other arrangement which holds the larger
carbon D (Fig. 1) suitable for use with a continuous current.
The carbon D may
be held in the sleeve by a second spring or screw or by a ball or plunger upon
I which the spring holding the sleeve B also presses.
Another method is to have the upper carbon holder C provided with two holes,
one suitable for the larger carbon used with continuous current, and the other for
the smaller carbon. In this case the carbon holder will be movable about a centre
screw, fixed to the guide E so as to bring the upper carbon D in line with the
lower D₁ the carbon holder C being held in the most suitable position by a set
:screw or other arrangement as will readily be understood. The carbons may be
held by a wedge pressed into a slot cut in the body of the holder between the two
carbon holes by a spring.
The carbons may be held by a ball G of greater diameter than the thickness of
the wall of the carbon holder C, pressed against it by a spring H, the ball being
prevented from falling out by a rim of metal left at the bottom of the hole when
drilling it. The hole is of just sufficient size to allow the ball to move freely in it.
The carbous may be held by set screws or other suitable arrangement.
The upper and lower carbon holders C and C₁ are carried on the frame K of the
lamp by guides E and F which are actuated by a screw or worm L and pinion N
working into racks attached to or formed on the guides E and F or other suitable
arrangement. The pinion N is made in two parts or in one piece wide enough to
suit the worm and racks, and the worm L is carried on a bearing T on the frame K
and is actuated by the spindle M and milled head O. The guides E and F are
held in position by suitable bearings U with spring contacts at V. The spring
contacts V consist of suitable pads bearing on the frame E, and pressed against
same by springs contained in the boxes which also embrace the pad to prevent it
moving with the frame. The frame K of the lamp is attached to the standard P

page_text: by a screw, bolt or rivet Q, about which it is movable. The lamp is held either in.
the vertical or inclined position by a ball pressed into one of two shallow holes
drilled in the body of the frame K, and acting in the usual well known manner.
The two positions may be maintained by means of a thumb screw passing through
the standard P and entering holes R or S in the frame K. The carbon holder C,.
is insulated from the guide F and consequently the body of the lamp, by a
washer W of suitable insulating material, and fixed by insulated screws in the
usual manner. The current is conducted to this carbon holder by a flexible
connection from the wing nut Y to which the lead is clamped to the screw X, the
other lead being connected to the frame of the lamp K by a similar wing nut on
the standard P.
The lamp is attached to a suitable base Z. For striking the arc a quick.
movement may be obtained by pulling the worm L endwise in its bearing T,
arranged to suit, the worm being returned to, and maintained in its normal position.
by a spring. It will readily be understood that this lamp can be used in any
position to suit requirements.
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 I
claim is:-
1. In a band regulated arc lamp, the spring H and ball G, for the purposes.
herein described.
2. In a band regulated arc lamp, the sleeve B and spring A, for the purposes.
herein described.
3. In a hand regulated arc lamp the method of adapting the lamp for direct or
alternating currents, by varying the angle of the carbons to the vertical as and for
the purposes herein described.
4. In a hand regulated arc lamp the racks in the slides E, F, the pinion and
worm wheel N, together with the worm L, spindle M, and milled head O, with.
bearings as and for the purposes herein described.
5. In a hand regulated arc lamp the spring boxes V forming sliding contacts.
with the slide E as herein described.
6. In a hand regulated arc lamp the arrangement of the worm L together with.
a spring, for striking the arc as herein described.
7. The combination of the various parts to form a hand regulated arc lamp as.
herein described.
Dated this 7th day of March 1896.
JOHN HEWETT, B.A.,
8, Great Portland Street, London, W., Agent for the Applicant..