Rheotome.
An automatic circuit breaker, one which rapidly opens and closes a
circuit, as in the case of the primary of an induction coil an
interrupter. (Obsolete.)
Rheotrope.
A pole changer, current reverser, or commutator, g., such as the
commutator of an induction coil. (Obsolete.)
Rhigolene.
A petroleum product; a hydrocarbon of low boiling point. Its vapor is
used in flashing (q. v.) carbon filaments for incandescent lamps.
Rhumbs.
In a mariners' compass, the thirty-two points, designated, north, north
by east, north north east, etc. (See Compass Mariner's-Compass, Points
of the.)
Rhumkorff Coil.
The induction coil, q. v.
Rigidity, Molecular.
The tendency of molecules to resist rotation or change of position; the
assumed cause of magnetic coercive force, or retentivity.
Ring Contact.
A contact formed by a terminal clip in the shape of a ring, split or cut
at one point so that its ends tend to spring together. The other
terminal is a bar which passes into the cut and is tightly pressed by
the elastic ring.
Fig. 298. SWITCH WITH RING CONTACTS.