Teazer.
Originally a fine wire coil wound on the field magnets of a dynamo in
shunt with the regular winding to maintain the magnetism. It was
originally used in electroplating machines to prevent inversion of the
magnetism, but has since developed into a component part of the winding
of the compound dynamo. (See Dynamo, Compound.)
Tee, Lead.
A lead pipe of T shape used for connecting branches to electric cables.
The tee is soldered by wiped joints to the lead sheathings of the cable
and branches after the wires have been connected, and the junctions
coated with insulating tape or cement, or both.
It is sometimes made in two halves, and is known as a split tee.
Tel-autograph.
A telegraph for reproducing the hand-writing of the sender at the
receiving end of the line. To save time a special spelling is sometimes
used.
Teleautograph.
The special spelling used with the Tel-Autograph telegraph.
Tele-barometer, Electric.
A barometer with electric attachment for indicating or recording at a
distance the barometric readings.
Telegraph, ABC.
This term is applied to alphabet telegraphs indicating the message by
the movements of a pointer on a dial marked with the characters to be
sent. In England the Wheatstone ABC system is much employed.
Telegraph, Automatic.
A telegraph system based on the operation of the transmitting instrument
by a perforated strip of paper drawn through it. The perforations made
by an apparatus termed a perforator, are so arranged as to give
telegraphic characters of the Morse or International Code in the
transmitting instrument. (See Perforator.) Bain in the year 1846 was the
originator of the system. He punched a fillet of paper with dots and
dashes, and drew it between two terminals of the line, thus sending over
the line a corresponding series of short and long currents which were
received by his chemical receiver. (See Chemical Receiver.) The method
was not successful. Its modern development, the Wheatstone Automatic
Telegraph, is highly so. The perforated paper by its perforations
controls the reciprocating movement of two rods, which pass through each
hole in two rows, corresponding to the two rods respectively as the
holes come opposite to the ends of the rods. The rods are kept
constantly moving up and down. If unperforated paper is above them their
upward motion is limited. This gives three positions for the rods, (a)
both down, (b) one up and the other down, (c) both up. These positions
of the rods work a pole changing key by which dots, spaces, and dashes
are transmitted to the receiving instrument, which is an exceedingly
delicate ink-printer. The latter can have its speed adjusted to receive
from 200 to 450 words per minute.