Induction, Unit of Self-.
The unit of self-induction is the same as that of induction in general.
It is the henry, q. v.
Induction, Unipolar.
Induction produced in a conductor which continuously cuts the lines of
force issuing from one pole of a magnet. As the lines of force are
always cut in the same sense a continuous and constant direction current
is produced.
Induction, Vertical.
In an iron or steel ship the induction or attraction exercised in the
compass by vertical elements of the structure. Such vertical masses of
iron in the northern hemisphere would have their upper ends polarized as
south poles, and would affect the magnet as soon as the vessel swung out
of the magnetic meridian. Thus this induction disappears twice in
swinging a ship through a complete circle; deviation due to it is termed
semi-circular deviation. (See Deviation, Semi-circular.)
Fig. 202. INDUCTOR DYNAMO.
Inductophone.
A method of train telegraphy. The train carries a circuit including a
coil, and messages are picked up by it from coils along the line into
which an alternating current is passed. A telephone is used as a
receiver in place of a sounder or relay. The invention, never
practically used, is due to Willoughby Smith.