IMPROVEMENTS IN ELECTRIC LAMPS OR LIGHTING APPARATUS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Henry Harris Lake at the Office of
the Commissioners of Patents on the 18th December 1882. Communicated
to him from abroad by Jean Kremenezky of Vienna in the Empire of Austria
HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN ELECTRIC LAMPS OR LIGHTING
APPARATUS [a communication to him from abroad by Jean Kremenezky of
Vienna in the Empire of Austria]
"
This Invention relates to electric lamps one or more of which can be used in a
single circuit
The said Invention comprises improved regulating apparatus suitably arranged
in connection with solenoids which serve for operating the same.
It also comprises
the general construction of the lighting apparatus and details thereof as herein-
after set forth.
According to the said Invention I construct the apparatus in the following
manner, that is to say, I provide two solenoids which stand one above the other on
the same axial line and each of which has in its centre a tubular core through.
which passes the upper carbon-holder
The said solenoids are arranged relatively to each other in such a manner that
the coil for the primary current is carried above the coil in the derived or shunt
circuit, by three columns. The lower coil is placed directly upon the base-plate of
the lamp and a space is left between the two solenoids for the regulating mechanism
The cores of both the solenoids are connected by links (or if desired they may be
in one integral piece and provided with slots) and act together upon two pawls
which are pivotted to forks or arms attached to a socket which is free to slide
upon the upper carbon rod The said pawls are connected with the core of the
upper solenoid by means of double jointed connecting links, and they can move
freely up and down with these; in their normal position the pawls rest near their
free ends upon a fork suitably arranged so that it can be adjusted, and when
lowered their inwardly turned ends are withdrawn from the upper carbon holder,
that is to say they open radially and thus allow the said upper carbon-holder to
slide downwards, until the iron core of the upper solenoid is lifted together with
the double jointed connecting links, when the said pawls close, rise from the ends
of the fork, and clip the upper carbon holder between them and then move down

page_text: until the pawls rest upon the fixed fork and thus open again, so that by the
smallest radial movement, the upper carbon-holder can be allowed to slide. The
upper carbon holder is provided with two long slots to receive two cords which
pass over two pulleys for the purpose of partially balancing the moving carbon-
holders the said cords connected with the lower carbon-holder. The said lower
carbon holder has guide rollers on both sides and a piston rod and piston which
is moved in a cylinder filled with mercury or glycerine. The said piston has very
little play so that the movement is slow, and thereby prevents a too violent and
abrupt motion of the iron cores of the solenoids and of the carbon-holders. The
frame rods between which the lower carbon holder is guided by means of the guide
rollers are fixed in, and insulated from, the base plate and carry below a cross piece
which again carries the cylinder. The upper carbon holder is constructed with a
ball and socket joint for the purpose of adjusting the carbon points. The upper
carbon holder is guided partly in the base-plate and partly in a main upper tube
by means of a small circular plate attached to it and moving in the said tube.
Upon the said circular plate small brass balls are placed to form the contact for
supplying the current The regulation of the lamp is effected by shifting the cores
of the solenoids up or down, which is effected by means of the adjustable fork.
When one or more lamps are arranged in the same circuit, each of the said lamps
is provided with a rheostat which receives a current partly from the principal, and
partly from the shunt, current, and in case one of the lamps should refuse to act,
the said rheostat offers a resistance to the passage of the current in proportion to
that of the lamp so as not to disturb the action of the other lamps.