This simple form is capable of meeting more complicated requirements by installing two-way switches, so that ... to be able to vary the number of lights turned on in a multiple-light electrolier by the aid of two or three switches, the usual way isanbsp;...
Title | : | "The Electrician" wireman's pocket book and electrical contractor's handbook |
Author | : | P.P. - London. - Electrician |
Publisher | : | - 1912 |
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