Remanence.
The residual magnetism left after magnetic induction, expressed in lines
of force per square centimeter.
Repeater.
In telegraphy an instrument for repeating the signals through a second
line. It is virtually a relay which is operated by the sender, and which
in turn operates the rest of the main line, being situated itself at
about the middle point of the distance covered. In the simpler forms of
repeater two relays are used, one for transmission in one direction the
other for transmission in the other. An attendant switches one or the
other in as required.
Thus a common relay is virtually a repeater for its local circuit. If
such a relay is placed half way down a line, and if the line beyond it
is connected as its local, it becomes a repeater.
Some forms of repeaters are automatic, and repeat both ways without the
need of an attendant.
It is the practice to somewhat prolong the signals sent through a
repeater.
Replenisher, Sir William Thomson's.
A static accumulating influence machine contained in Thomson's quadrant
electrometer and used to change the quadrants. The cut shows the
horizontal section and construction of the apparatus.
It contains two gilt brass inductors A B, and two eccentric sectors or
carriers, C, D, which are mounted on an ebonite spindle, which is spun
around by the fingers. The springs s s1 connect each with its inductor;
the springs S S1 connect only each other, and touch the sectors as they
turn around.
One of the inductors may be always assumed to be of slightly higher
potential than that of the other one. When the carriers are in contact
with the springs S S1 they are each charged by induction with
electricity opposite in sign to that of the nearest quadrant. As they
leave the springs S S1 in their rotation, they next touch the springs s
s1, but of the recently opposite inductor. They share each a portion of
its charge with the inductors building up their charges. The action is
repeated over and over again as they rotate.
Fig. 290. THOMSON'S REPLENISHER.