Transmitter.
In general electric phraseology, any instrument which produces signals
to be transmitted through a line or circuit is a transmitter. Thus the
Morse key in telegraphy or the Blake transmitter in telephony are
examples of such.
Transmitter, Carbon.
A form of microphone used as a telephone transmitter. (See Carbon
Telephone.)
Transposing.
A method of laying metallic circuits for telephoning. The wires at short
intervals are crossed so that alternate sections lie on opposite sides
of each other. It is done to avoid induction.
Transverse Electro-motive Force.
Electro-motive force in a substance in which electric displacement is
taking place, produced by a magnetic field. It is sometimes assigned as
the cause of the Hall effect, q. v.
Trimmer, Brush.
A shears for cutting off evenly and squarely the ends of copper dynamo
brushes. The brushes when uneven from wear are removed from the brush
holders, and their ends are sheared off in the trimmer.
Trolley.
A grooved metallic pulley or set of pulleys which runs along an active
wire of a circuit, a lead from which trolley goes to earth or connects
with another wire, so that the trolley takes current generally for
operating a street car motor placed upon the circuit leading from it; a
rolling contact with an electric lead.
Trolleys are principally used on electric railroads, and are now
universally of the sub-wire system, being at the end of a pole which is
inclined backward and forced upward by springs, so as to press the
trolley against the bottom of the wire. Thus the trolley does not
increase the sagging of the wire, but tends to push it up a little in
its passage.
Trolley, Double.
A trolley with two rollers or grooved wheels, placed side by side, and
running on two parallel leads of wire. It is adapted to systems
employing through metallic trolley lines with the motors in multiple
arc, connecting or across the two leads.
Trolley Section.
An unbroken or continuous section of trolley wire.
Trouvé's Solution.
An acid exciting and depolarizing solution for a zinc-carbon battery.
Its formula is as follows: Water, 80 parts; pulverized potassium
bichromate, 12 parts; concentrated sulphuric acid, 36 parts; all parts
by weight. The pulverized potassium bichromate is added to the water,
and the acid is added slowly with constant stirring. As much as 25 parts
potassium bichromate may be added to 100 parts of water. The heating
produced by the acid and water dissolves nearly all the potassium salt.
Use cold.