A New or Improved Electric Arc Lamp.
Year: 1890

page_text: Date of Application, 16th June, 1890
Complete Specification Left, 4th Mar., 1891-Accepted, 11th Apr., 1891
PROVISIONAL SPECIFICATION.
A New or Improved Electric Arc Lamp.
ERNEST THOMAS HEADECH, 61, Falmouth Road, New Kent Road, in the
County of London, Electrical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to a new or improved electric arc lamp, and is constructed
in the following manner.
The lamp consists of a strong single frame of metal Fig. 1, preferably of gun
metal, on top of which frame is cast a circular plate for holding the gear, and
the bottom is formed to carry the negative carbon holder Fig. 10. The whole
frame with top & bottom plates is one casting. By this method there are no nuts
to get loose, or connections to get faulty. This circular plate carries a solenoid, or
hollow magnet with loose sliding core Fig. 2. The core of this solenoid is con-
structed of the softest flat iron Fig. 3. To the end of the core is attached the top,
or positive carbon holder. The solenoid is wound with thick wire & is in series
with the main current, on top of solenoid is fixed a plate Fig. 4, which carries a
pedestal Fig. 5, in the top of which turns a grooved wheel Fig. 6 over which runs
a cord Fig. 7, which is connected at one end to the top of the core Fig. 3, and the
other end is fastened to a weight Fig. 8, which slides freely up or down the guide
bars Fig. 9.
This weight is an adjustable balance weight, to balance the weight of
the core & top carbon holder, as well as being a most efficient regulator, the weight
is composed of a hollow tube closed at both ends but capable of being opened, this
tube may be filled with small shot, mercury, or even water & may be added to or
reduced as the case may be, by a cap at top & bottom of tube. A carbon clamp or
holder is a permanent fixture to the bottoni of frame, but, should a focussing lamp
be required, this holder may be suitably connected to the bottom end of balance
weight & the two carbons would then travel at the same rate & the arc would keep
practically in the same place. A reflector may be attached to the lamp frame by
2 or more screws or other means Fig. 11, a reflector is not shewn in the drawing.
The current to work the lamp is brought to.the 2 terminals Fig. 12 by the ordinary
method of a pair of wires from the main. The action of the lamp is as follows,
the carbon being in contact, the current is switched on & the solenoid immediately
sucks up the core & in so doing "strikes the arc," (the length of the arc will be
proportionate to the amount of current supplied to the lamp this may be regulated
by adding to, or reducing the weight of the counter balance, as the case may be,)
as the arc gets longer, the resistance gets greater & thereby weakening the
solenoid, the core drops & the correct length of arc restored, the core cannot drop
with a jerk, as the balance weight holds it back to a certain extent acting as a brake,
it will be seen that this lamp cannot feed in jerks, as, it is really a continuous feed,
but the movement is so slight that it would be hardly discerned by the naked eye.
Dated this 16th day of June 1890.
ERNEST THOMAS HEADECH,
61, Falmouth Road, New Kent Road, London, S.E.

page_text: A New or Improved Electric Arc Lamp.
ERNEST THOMAS HEADECH, Electrician, 61, Falmouth Road, New Kent Road,
London, S.E., 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 :-
This invention relates to a new or improved electric arc lamp, and is constructed
in the following manner.
The lamp consists of a strong single frame of metal 1, preferably gun metal
on top of which frame is cast a circular plate for holding the gear, and the
bottom is formed to carry the negative carbon holder 10, the whole frame with
top and bottom plates is one casting. By this method there are no nuts to get
loose or connections to get faulty. This circular plate carries a solenoid or hollow
magnet with loose sliding core 2. The core of this solenoid is constructed of the
softest flat iron as 3. To the end of the core is attached the top, or positive carbon
holder. The solenoid is wound with thick wire and is in "series" with the main
current. On top of solenoid is fixed a plate 4 which carries a pedestal 5 in the top
of which turns a grooved wheel 6 over which runs a cord 7 which is connected at
one end to the top of the core 3 and the other end is fastened to a weight 8 which
slides freely up or down the leg of the frame 1, or may be made to slide on a pair
of guide bars stretched from the circular plate down to a projecting plate at bottom
of leg of frame. This weight is an adjustable balance weight, to balance the weight
of the core & top carbon holder, as well as being a most efficient regulator. The
weight is composed of a hollow tube closed at both ends but capable of being
opened, this tube may be filled with small shot, mercury, or even water, & may be
added to or reduced as the case may be, by a cap at top & bottom of tube.
carbon clamp or holder is a permanent fixture to the bottom of frame 10, but if a
focussing lamp be required, this holder may be suitably connected to the bottom
end of balance weight & the two carbons would then travel at the same rate, &.the
are would keep practically in the same place.
For arrangement of same refer to Fig. A.
A
Instead of the negative carbon holder being a fixture as in Fig. B. 10 it is formed
with a slotted tail piece D in which runs a friction wheel E, on the front side, & a
slipper block Fat the back, which may be adjusted for taking up slack from
wear &c. The balance weight is similar to the balance of the fixed carbon lamp in
construction & is fixed to sliding holder by a screw or other means. The positive
carbon holder is insulated from the rest of the lamp by a plate of insulating
substance, vulcanized fibre for instance, H. A reflector may be attached to the
lamp frame by 2 or more screws or other means 11 a reflector is not shewn in the
drawing. The lamp is suspended by a pair of light iron or brass rods tapped into
the circular plate at bottom, & their tops screwed into a cross piece fitted with a
swivel hook in the centre, over which the weather case is placed. The current to
work the lamp is brought to the 2 terminals 12 by the ordinary method of a pair
of wires from the main. The action of the lamp is as follows, The carbons being
in contact with each other, the current is switched on & the solenoid immediately
sucks
up the iron core, & in so doing strikes the are," the length of arc will be
proportionate to the amount of current supplied to the lamp, this may be regulated
by adding to or reducing the weight of the counter balance as the case may be. As
the arc grows longer the resistance gets greater thereby weakening the solenoid, the
core gradually drops till the correct length of are is restored, the core cannot drop
with a jerk as the balance weight holds it back, to a certain extent acting as a
brake, it will be seen that this lamp cannot feed in jerks as it is really a continuous
feed, but the movement is so slight that it would be hardly discernible to the
naked eye.
"

page_text: Having now described and ascertained the nature of my said invention, and in
what manner the same is to be performed, I declare that what I claim is :-
1. A lamp with a single frame & gear plate in one casting.
2. An adjustable balance weight, to counter balance the weight of solenoid core &
carbon holder as shewn & described.
3. A focussing arrangement as shewn & described, and by the drawings.
4. An electric arc lamp composed of the aforenamed arrangements & as shewn
by the drawings.
Dated this 4th day of March 1891.
ERNEST THOMAS HEADECH,
61, Falmouth Road, New Kent Road, London, S.E.