Year: 1895

page_text: Date of Application, 30th Dec., 1895
Complete Specification Left, 30th Sept., 1896-Accepted, 7th Nov., 1896
I, SAMUEL SEALY ALLIN, of No. 25 Garlick Hill, Cannon Street, in the City
of London, Engineer, do hereby declare the nature of this invention to be as
follows:-
In my Specification No. 17357 of 1894 I described an electric arc lamp having
the upper and lower carbon holders connected by a chain passing over a sprocket
wheel and a pulley, the sprocket wheel being connected by gearing to an escape-
ment, working a balance wheel, and the pulley being mounted on a lever connected
to the core of a series solenoid having its coil in the circuit of the lamp.
Also the balance wheel worked by the escapement was provided with a brake
connected to the core of another solenoid having its coil in a shunt to the lamp
circuit. In a lamp thus arranged, the arc is struck, on putting the lamp in circuit,
by the core of the series solenoid letting the lower carbon descend from the upper,
and afterwards the carbons are fed by the sbunt solenoid taking the brake off the
balance wheel and so allowing the upper carbon to descend, its speed being
moderated by the action of the escapement and balance wheel driven by its
descent.
My present invention relates to a modification of a lamp of this kind so as to
adapt it for receiving two pairs of carbons, the second pair to burn after the first
pair are consumed, and also to adapt the lamp for operating with currents of
various tensions.
For this purpose, I provide two sprocket wheels over which pass the chains of
the two pairs of carbon holders and I connect both these wheels to the escapement
gearing by ratchets and pawls so arranged that either sprocket wheel can revolve
driving the escapement while the other is at rest. When the carbons are so
arranged that the one sprocket wheel has to move oppositely to the other, I connect
one of the sprocket wheels to its ratchet through an intermediate wheel so that
both ratchets move in the same direction. I connect the second pair of carbon
holders to the lamp terminals through a switch operated by the armature of an
electromagnet so that when the carbons of the first pair are consumed their holders
being thus cut out of the lamp circuit, the holders of the other pair are switched
into the circuit.
In order to suit the lamp for operating with currents of greater or less tension,
I wind the shunt solenoid with two or more separate wires, using preferably wires
varying in resistance, such, for example, as copper for one wire and German silver
for another, when two wires are used, this number being generally sufficient
I connect these wires at one end to one of the lamp terminals, and their other ends
to contact plates circularly arranged under a revolving brush or rubber which is
connected to the other lamp terminal. I prefer to arrange those contact plates
and the rubber, forming together a commutating switch, on the end of the bobbin
of the shunt solenoid, the rubber turning round the tube of the bobbin as an axis.
By turning the rubber to one or another of the contact plates I can bring any one of
the wires into the shunt circuit, or both of them either in series or parallel, and thus
I can make the resistance of the shunt coil suitable to the tension of the current
which supplies the lamp.
Dated this 30th day of December 1895.
ABEL & IMRAY,
Agents for the Applicant.

page_text: Improvements in Electric Arc Lamps.
I, SAMUEL SEALY ALLIN, of No. 25 Garlick Hill, Cannon Street, in the City
of London, 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 my Specification No. 17357 of 1894, I described an electric arc lamp having
the upper and lower carbon holders connected by a chain passing over a sprocket
wheel and a pulley, the sprocket wheel being connected by gearing to an escapenient,
working a balance wheel, and the pulley being mounted on a lever connected to
the core of a series solenoid having its coil in the circuit of the lamp.
Also the balance wheel worked by the escapement was provided with a brake
connected to the core of another solenoid having its coil in a shunt to the lamp
circuit. In a lamp thus arranged, the arc is struck, on putting the lamp in circuit,
by the core of the series solenoid letting the lower carbon descend from the upper,
and afterwards the carbons are fed by the shunt solenoid taking the brake off the
balance wheel and so allowing the upper carbon to descend its speed being
moderated by the action of the escapement and balance wheel driven by its
descent.
My present invention relates to a modification of a lamp of this kind so as to
adapt it for receiving two pairs of carbons, the second pair to burn after the first
pair are consumed, and also to adapt the lamp for operating with currents of
various tensions.
For this purpose I construct the lamp as I shall describe referring to the
accompanying drawings.
Figure is a side view partly in section of the upper part and regulating
mechanism, Figure 2 is a plan thereof.
Figure 3 is a plan of the automatic cut out,
Figures 4 and 5 shew the catch for the rock lever engaged and disengaged
respectively.
Figure 6 is a longitudinal section and Figure 7 a front view of the driving
wheel for the escapement with sleeves and ratchets,
Figure 8 is a plan looking from below of the commutating switch, and
Figure 9 is a diagram of the electrical connections.
I provide two sprocket wheels A A' over which pass the chains of the two pairs
of carbon holders, B being the upper and C the lower carbon holder for one pair
of the carbons and BC those for the other pair and I connect both these
wheels A A¹ to the driving wheel D of the escapement gearing by ratchets and
pawls E E' so arranged that either sprocket wheel A or A¹ can revolve driving
the escapement while the other is at rest.
To the upper and lower carbon holders of one pair of carbons I attach contact
pieces FF which, when that pair of carbons is consumed meet as shewn in
Figure 1 thereby completing a circuit from the upper carbon holder of the first
pair to that of the second pair as will be understood on inspecting the diagram
Figure 9. The current in the first instance passed from the + terminal through
the first pair of carbons BC and one of the arc striking solenoids S to the. terminal
the second pair of carbons B₁ C¹ and their arc striking solenoid S¹ being out of
circuit. On the first pair of carbons being consumed and their contacts F F¹
meeting, the circuit is closed from the + terminal through B, FF to B¹ thence
through the second pair of carbons to C¹ through their are striking solenoid S¹ to
the terminal.
When the lamp is out of circuit the core of the solenoid S pulls down the arm
of the lever K which is then held down by a hanging catch H.

page_text: On putting the lamp in circuit, a piece of iron G fixed on the top of the
solenoid S becomes magnetised and attracts the catch H which held down the lever
arm, and the core of S being attracted upwards the lower carbon is allowed to.
descend striking the arc.
In order to suit the lamp for operating with currents of greater or less tension,.
I wind the shunt solenoid Z with two or more separate wires, using preferably-
wires varying in resistance, such for example, as copper for one wire c, and German
silver for another y, when two wires are used, this number being generally sufficient,.
1 connect these wires at one end to one of the lamp terminals, and their other ends
to contact plates circularly arranged under a revolving brush or rubber R..
I prefer to arrange those contact plates and the rubber, forming together a
commutating switch, on the end of the bobbin of the shunt solenoid Z, the rubber
turning round the tube of the bobbin as an axis. By turning the rubber to one or
another of the contact plates I can bring any one of the wires into the shunt
circuit, or both of them either in series or parallel, and thus I can make the
resistance of the shunt coil suitable to the tension of the current which supplies
the lamp.
As shown in Figure 8 the commutator consists of two layers of metallic segments.
insulated from each other, the ends of the two outer segments overlapping one of
the inner, the rubber consists of a tongue sliding on the inner layer. One of the
lamp terminals, say +, and the inner end of the inner coil are connected to one of
the inner segments. The outer end of the same coil is connected to an opposite
inner segment.
1
The ends of the outer coil are connected to opposite outer segments to one of
which the terminal of the lamp is connected. By turning the rubber so as to-
be free from the outer segments or to come between one of them and the inner
segment, the two coils of the solenoid can be put in series or parallel, or one can
be cut out of circuit.
Having now particularly described and ascertained the nature of my said.
invention and in what manner the same is to be performed, I declare that what
1 claim is :-
1: The construction of an electric arc lamp adapted for two pairs of carbons,.
substantially as described with reference to the accompanying drawings.
2. In a lamp such as is above referred to, the combination of two sprocket wheels,
sleeves and ratchet wheels with a pair of pawls on the driving wheel of the
regulating escapement, substantially as and for the purpose set forth.
3. In combination with two or more coils in the regulating solenoid a com-
mutating switch arranged and operating substantially as and for the purpose set
forth.
Dated this 30th day of September 1896.
47
0
ID VZ
ABEL
EL & IMRAY,
Agents for the Applicant..