Electric Arc Lamp.
Year: 1886

page_text: Date of Application, 15th Apr., 1886.
Complete Left, 15th Jan., 1887.
Complete Accepted, 25th Feb., 1887.
Electric Arc Lamp.
JOHN LOUIS BALBI Electrical Engineer of 59 Guildford Street, Russell
Square W.C. & FREDERICK TOLLEY articled clerk of 25 Philpot Lane E.C. do
hereby declare the nature of our invention for ELECTRIC ARC LAMP to be as
follows:-
:-
Our invention consists of an improved form of Electric Are Lamp, whereby great
steadiness in the light emitted, simplicity of construction & cheapness in manufacture
are insured. We carry out our invention in one way by having a long rack, at one
end of which the positive carbon is attached; this rack is in gear with a pinion
which consists of two parts: one the pinion proper which is made of brass & the
other attached to it-of an iron or steel ring, the two thus combined being able to
turn on a spindle attached to the frame-work of the lamp. We also have a selenoid,
wound with several turns of thick wire, which forms part of the main circuit. &
also with fine wire which forms a shunt to the arc in the centre of the selenoid
enters an iron or steel rod to the opposite end of which is fixed a small rack, in
close proximity to the pinion above mentioned. We also have an electro-magnet
which is part of the main circuit, the case of this electro-magnet is moveable by
means of a set screw, thus being able to be brought farther or closer to the periphery of
the steel or iron ring fixed to the pinion as before mentioned. The action of the
lamp is the following: The current enters by one of the terminals & passes through
the selenoid, from the selenoid to the electro-magnet & from this by means of a
brush contact or other connection to the rack at the end of which the positive carbon
is attached, then through the arc & by the negative carbon to the return terminal.
The current. by passing thro' the selenoid causes it to attract or suck in the iron or
steel rod, to which further end the small rack is attached; this being in close
proximity to the pinion, the attraction of the selenoid will cause it to come into gear
with the pinion & thus turn it round & this again being in gear with the rack to

page_text: which the positive carbon is attached, will lift it, thus establishing the arc. The
current passing through the electro-magnet above mentioned will cause its core to
attract the iron or steel ring of the pinion & thus act as a brake. The object of the
fine wire wound round the selenoid is to regulate the size of the are by counteracting
the effect of the current passing through the thick wire of the selenoid. Another
way of regulating the arc is the following: We have a rack, similar to the one afore
described in gear with it we have a section of an iron or steel pinion moveable on a
centre. This section can be attracted or sucked in by a selenoid, which can be moved
on or fixed to the same centre of the iron ring, & the same action as explained in the
first device takes place.
JOHN LOUIS BALBI.
FREDK. TOLLEY.

page_text: JOHN LOUIS BALBL of 59 Guildford Street Russell Square W.C. Electrical
Engineer & FREDERICK TOLLEY of 25 Philpot Lane E.C. articled pupil to a solicitor
do hereby declare the nature of our invention for IMPROVEMENTS IN ELECTRIC ARC
LAMPS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
"
Our invention consists of an improved "Electric are lamp" whereby steadiness in
the light emitted, simplicity in construction & cheapness in manufacture are insured.
We carry out our invention in one way by having a long rack which extends
through a long distance, at one end of which the positive carbon is fixed. This rack
is in gear with a pinion, which consists of two parts one the pinion proper which is
made of brass, & the other attached to same of an iron or steel ring-the combination
of the two being able to turn on a spindle, attached to the framework of the lamp,
We also have a selenoid wound with several turns of thick wire, which forms part of
the main circuit & also with fine wire, which forms a shunt to the are. Inside the
selenoid there is an iron case which can be moved by means of a set screw, & in its
centre enters an iron or steel rod at one end of which is an iron core moving inside
the selenoid, & therefore capable of being more or less attracted by it & at the other
end of the same iron or steel rod is a rack in close proximity to the pinion above
mentioned. We also have an Electro-magnet which forms part of the main circuit:
the core of this Electro-magnet is moveable by means of a set screw thus bringing it
more or less close to one of the iron arms of a bell-crank arrangement, which in com-
bination with the Electro-magnet & iron ring of the pinion forms à brake on the
pinion. On the spindle on which the pinion turns is a pulley over which is wound a
cord to one end of which a weight is attached.
&
The action of the lamp is the following: The current enters hy one of the terminals
passes through the Electro-magnet from the Electro-magnet to the selenoid & from
this by means of a wheel contact or other connection to the rack at one end of which
the positive carbon is attached; then through the are & by the negative carbon to the
framework & from the framework to the return terminal. The electric current by
passing through the selenoid causes it to attract or suck in the iron core attached to
the iron or steel rod, which at its further end has the small rack; thus being in close
proximity to the pinion, the attraction of the selenoid causes it to turn round the
pinion & this again being in gear with the rack, to which the positive carbon is
attached, will lift it, thus establishing the are. The electric current passing through
the Electro-magnet above mentioned will attract the iron-arm of the bell-crank, which
is close to it & thus magnetise it & bring the other arm in contact with the periphery
of the iron ring of the pinion & thus act as a brake on same. The object of the fine
wire wound round the selenoid is to counteract, if wanted, the effect of the current
passing through the thick wire. Obviously when the current in the main circuit geis
weaker owing to the increase in length of the are, the current in the thick wire of the
selenoid will be less & therefore also the attracting power of the selenoid, the con-

page_text: sequence being that the iron core attached to the iron or steel rod will be less & less
attracted & if the fine wire he also used, it will lessen still more the attraction, &
therefore the rack will fall by its own weight to the required distance for the are.
Referring to Fig. I in the accompanying drawing:
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 :
1st. The combination of a rack & pinion & selenoid with moveable corc, & steel rod
with core at one end & rack at the other, as before described, to regulate the arc.
2nd. The combination of the iron or steel ring attached to the pinion & the electro-
magnet with moveable core & the bell-crank arrangement to act as a brake.
3rd. The combination of a rack & section acted on by a selenoid for regulating
the arc.
J. L. BALBI.
FREDK. TOLLEY.