Telephone, Reaction.
A form of telephone containing two coils of insulated wire, one of which
is mounted on the disc, and the other on the magnet pole in the usual
way. These coils react upon each other so as to strengthen the effect.
Telephone, Thermo-electric.
A telephone transmitter including a thermo-electric battery, placed in
circuit with the line. A plate of vulcanite faces it. When the sound
waves strike the vulcanite they move it backward and forward. These
movements, owing to the elasticity of the vulcanite, produce minute
changes of temperature in it, which affecting the thermo-electric pile
produce in the circuit currents, which passing through a Bell telephone
cause it to speak. This type of instrument has never been adopted in
practice.
Telephote.
An apparatus for transmitting pictures electrically, the properties of
selenium being utilized for the purpose.
Synonym--Pherope.
Teleseme.
An annunciator, displaying on a dial the object wanted by the person
using it. It is employed to transmit messages from rooms in a hotel to
the office, or for similar functions.
Tele-thermometer.
A thermometer with electric attachment for indicating or recording its
indications at a distance.
Tempering, Electric.
A process of tempering metals by electrically produced heat. The article
is made part of an electric circuit. The current passing through it
heats it, thereby tempering it. For wire the process can be made
continuous. The wire is fed from one roll to another, and if required
one roll may be immersed in a liquid bath or the wire between the rolls
may be led therein. The current is brought to one roll and goes through
the wire to the other. As it does this the wire is constantly fed from
one roll to another. The bath may be used as described to cool it after
the heating. The amount of heating may be regulated by the rate of
motion of the wire.