MICA INDUSTRY TO BE PLACED ON A SOUND AND STABLE FOOTING 177
The Advance of science, instead of rendering this natural product obsolete, has increased its importance. With the employment of higher temperatures of voltages in generators, as radio and television are developed, as the number of motor-cars and aeroplanes increases, and even as the electron is brought under control, mica becomes increasingly important.
It is considered indispensable for the following appliances :
(1) commutator segments, for motors and generators ;
(2) commutator V-rings, for motors and generators ;
(3) armatures (high temperature and high voltage);
(4) aeroplane motor spark plugs ;
(5) radio tubes;
(6) transformers ; and
(7) radio condensers.
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