Working, Double Curb.
A method of working telegraph lines. When a signal is sent the line is
charged. This has to be got rid of, and is an element of retardation. In
double curb working it is disposed of by sending a momentary current
first in the reverse, and then in the same, and finally in the reverse
direction. This is found to reduce the charge to a very low point.
Working, Hexode.
In multiplex telegraphy the transmission of six messages simultaneously
over one wire. (See Telegraphy, Multiplex.)
Working, Pentode.
In multiplex telegraphy the transmission of five messages simultaneously
over one wire. (See Telegraphy, Multiplex.)
Working, Reverse Current.
A method of telegraphy, in which the currents are reversed or alternated
in direction.
Working, Single Curb.
A simpler form of telegraph signaling than double curb working. It
consists in sending a reverse current through the line for each signal
by reversing the battery connection.
Working, Tetrode.
In multiplex telegraphy the transmission of four messages simultaneously
over the same line. (See Telegraphy, Multiplex.)
Working, Triode.
In multiplex telegraphy the transmission of three messages
simultaneously over the same wire. (See Telegraphy, Multiplex.)
Work, Unit of.
The erg, q. v. It is the same as the unit of energy, of which work is
the corelative, being equal and opposite to the energy expended in doing
it. There are many other engineering units of work, as the foot-pound
and foot-ton.
Yoke.
In an electro-magnet, the piece of iron which connects the ends furthest
from the poles of the two portions of the core on which the wire is
wound.
Zamboni's Dry Pile.
A voltaic pile or battery. It is made of discs of paper, silvered or
tinned on one side and sprinkled on the other with binoxide of
manganese. Sometimes as many as 2,000 of such couples are piled up in a
glass tube and pressed together with two rods which form the terminals.
They maintain a high potential difference, but having very high
resistance and slight polarization capacity, give exceedingly small
quantities.
Zero.
(a) The origin of any scale of measurement.
(b) An infinitely small quantity or measurement.