Improvements in Electric Arc Lamps.
Year: 1894

page_text: Date of Application, 18th Sept., 1894
Complete Specification Left, 15th July, 1895-Accepted, 24th Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
I, JAMES BROCKIE, of Fairview, Tyson Road, Forest Hill, in the County
of Kent, Engineer, do hereby declare the nature of this invention to be as
follows:
My invention relates to a simple and effective construction of electric arc lamp
and its regulating mechanism, I connect the upper and lower carbon holders by
chains or cords passing over a pulley or equivalent gear; on the upper end of the
lower carbon I place a nozzle such as to allow of its ascent only as it is consumed,
the movement of both carbons being thus determined by the consumption of the
lower. For regulating the movment I, according to one arrangement, connect the
nozzle to the core of a solenoid having its coil in shunt from the lamp circuit.
In repose, the carbons are apart as far as permitted by a stop determining
the descent of the core. When the lamp is put in circuit the solenoid is excited
attracting its core so as to bring the carbons near together, the attraction of the
core is thus lessened and they separate striking the arc. Afterwards, as the carbons
become consumed, when the resistance of the arc increases the core is attracted
upwards bringing the carbons nearer together. Should the resistance decrease, the
core descends separating the carbons. I prefer to provide the core with an
automatic pawl and ratchet permitting its free ascent but limiting its descent.
I also prefer to employ an upper carbon which consumes somewhat more rapidly
than the lower carbon, so that as the carbons are consumed the regulating movement
of the core is generally upwards. The variation in weight of the carbons, as they
are consumed, may be compensated by a chain in the known manner.
A lever or other arrangement may be employed for reversing the movement
communicated from the core, or the core may be arranged so as to be attracted
downwards, the solenoid coil being in that case in the lamp circuit. In either of
the arrangements a differentially wound solenoid may be employed. The nozzle on
the lower carbon may be stationary, the regulating movement being applied to the
upper carbon holder or the pulley over which the connecting chain or cord passes
or other connection of the carbons.
When the lamp is not required to have the arc always in one place, the lower
carbon holder is stationary, the nozzle descends as the lower carbon is consumed,
and by its descent it causes through suitable connecting gear the descent of the
upper carbon through a distance suited to the rate of consumption. The regulating
movement in this case is applied to the upper carbon holder, or the lower
carbon holder, instead of being stationary, may be adapted to receive this
movement.
A lamp may be arranged as above described with two pairs of carbons, the
second pair to be brought into action when the first pair is consumed. In this
case I prefer to make the upper carbon of the first pair to consume more
rapidly than the lower, and the lower of the second pair to consume more rapidly
than the upper, so that, during the consumption of the first pair, the regulating
n:ovement of the core is generally upwards, and during the consumption of the.

page_text: second pair it is downwards, a moderate stroke of the regulating core being thus
sufficient for both pairs.
Dated this 18th day of Sontember 1901
ABEL & IMRAY,
Agents for the Applicant.
Improvements in Electric Arc Lamps.
I, JAMES BROCKIE, of Fairview, Tyson Road, Forest Hill, in the County of
Kent, 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 :-
My invention relates to a simple and effective construction of electric arc lamp
and its regulating mechanism as I shall describe referring to the accompanying
drawings. I connect, as shewn in side view in Fig. 1 the upper and lower carbon
holders A and B by chains or cords C passing over a pulley D or equivalent gear;
on the upper end of the lower carbon I place a nozzle E having prongs which hold
down the carbon but allow its ascent as it is consumed, the movement of both
carbons being thus determined by the consumption of the lower. For regulating
the movement I, according to one arrangement, connect the nozzle E to the core F
of a solenoid G having its coil in shunt from the lamp circuit.
In repose, the carbons are apart as far as permitted by a stop determining the
descent of the core F. When the lamp is put in circuit, the solenoid is excited
attracting its core so as to bring the carbons near together, the attraction of the
core is thus lessened and the carbons separate striking the arc. Afterwards, as
the carbons become consumed, when the resistance of the arc increases, the core F
is attracted upwards bringing the carbons nearer together. Should the resistance
decrease, the core descends separating the carbons. I prefer to provide the core F
with an automatic pawl H and ratchet, permitting its free ascent but limiting its
descent. The pawl H being made of iron, its upper part is attracted when
the core F is magnetised, and it is thus engaged with the ratchet J which is kept
up by a spring but is free to descend a little when the pawl is engaged with it.
When F is not magnetised the pawl H is disengaged from the ratchet J. I prefer
to employ an upper carbon which consumes somewhat more rapidly than the lower
carbon, so that as the carbons are consumed the regulating movement of the core is
generally upwards. The variation in weight of the carbons as they are consumed
may be compensated by a chain in the known manner.
A lever or other arrangement may be employed for reversing the movement
communicated from the core, or the core may be arranged so as to be attracted
downwards, the solenoid coil being in that case in the lamp circuit.
In any of these
arrangements a differentially wound solenoid may be employed. As shewn in side
view in Fig. 2, the nozzle E may be stationary, the regulating movement being
applied to the upper carbon holder A and pulley P over which the connecting
chain or cord C passes, or other connection of the carbons.
A lamp may be arranged as above described with two pairs of carbons, the
second pair to be brought into action when the first pair is consumed. In this case,
I prefer to make the upper carbon of the first pair to consume more rapidly than
the lower, and the lower of the second pair to consume more rapidly than
the upper, so that, during the consumption of the first pair, the regulating movement
of the core is generally upwards, and during the consumption of the second pair it
is downwards, a moderate stroke of the regulating core being thus sufficient for
both pairs.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In an electric arc lamp, having its lower carbon provided with a nozzle allowing
it to ascend as it is consumed, connecting the upper to the lower carbon holder so
that the upper descends as the lower ascends, and regulating by means of a solenoid,
the movement resulting from the consumption of the carbons, substantially as
described.
1
T
1007
ABEL & IMRAY,
Agents for the Applicant.