Clock, Electrolytic.
A clock worked by the electrolytic deposition and resolution of a
deposit of metal upon a disc. It is the invention of Nikola Tesla. A
metallic disc is mounted on a transverse axis, so as to readily rotate.
It is immersed in a vessel of copper sulphate. A current is passed
through the bath, the terminals or electrodes being near to and facing
the opposite edges of the disc, so that the line connecting the
electrodes lies in the plane of the disc. If a current is passed through
the solution by the electrodes, copper is deposited on one side of the
disc, and as it rotates under the influence of the weight thus
accumulated on one side, the same metal as it is brought to the other
side of the disc is redissolved. Thus a continuous rotation is
maintained. The cause of the deposition and solution is the position of
the disc; one-half becomes negative and the other positive in their
mutual relations.
Clock, Self-winding Electric.
A clock which is wound periodically by an electric motor and battery.
Clockwork, Feed.
In arc-lamps the system of feeding the carbon or carbons by clockwork
whose movements are controlled by the resistance of the arc. This system
is employed in the Serrin, and in the Gramme regulators, among others.
The carbons, if they approach, move clockwork. The movement of this is
stopped or freed by an electro-magnet placed in shunt around the arc
and carbons.
Cloisons.
Partitions or divisions; applied to the winding of electro-magnets and
coils where the winding is put on to the full depth, over single
sections of the core, one section at a time, until the whole core is
filled up.
Closure.
The closing or completion of a circuit by depressing a key or moving a
switch.
Clutch.
In arc lamps a device for the feed of the upper carbons. In its simplest
form it is simply a plate or bar pierced with a hole through which the
carbon passes loosely. The action of the mechanism raises or lowers one
end of the plate or bar. As it rises it binds and clutches the carbon,
and if the action continues it lifts it a little. When the same end is
lowered the carbon and clutch descend together until the opposite end of
the clutch being prevented from further descent, the clutch approaches
the horizontal position and the rod drops bodily through the aperture.
The cut shows the clutches of the Brush double carbon lamp. In practice
the lifting and releasing as regulated by an electro-magnet are so very
slight that practically an almost absolutely steady feed is secured. A
similar clutch is used in the Weston lamp.