Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 227
INCANDESCENT ILLUMINANTS 205 … 206 EXPERIMENTAL ELECTRICITY shape—-oval coil, double coil, spiral, or hairpin — and areplaced in drying ovens, where they are left for two hours,the temperature being 450° F. They are then taken outand cut into separate filaments. In bunches of fifty theseseparate filaments are dipped in…
Electricity · Electrical engineering
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