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 230
p whenthe vacuum is nearly perfect. Whenthis point is reached, a small amount ofred phosphorus previously inserted inthe stem of the tube is heated, forminga gas which fills the space of the rarefiedair in the bulb. The stem is thensealed off, forming the well-known tipon the lamp. The lamp is then… … Fig. 270. — Bulb readyfor Exhaust. on a photometer. This voltage is then indicated on the label of the lamp. INCANDESCENT ILLUMINANTS 209 In this description some of the smaller steps have beeneliminated, owing to limited space; but further details willbe found in a pamphlet on Incandescent Lamps…
Electricity · Electrical engineering
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