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 220
s of range of contractionof the pupil, and also to interfere with ones ability to read ;thus, a i6-candle-power lamp in the field of vision de-creased ones ability to read by about 30%. With theNernst lamp the distribution of the light is quite uniform,the gradual illumination of the lamp is… … Fig. 264. — Holophane Reflector. THE ARC LIGHT 199 with their cores impregnated with calcium and strontium,having lower points of combustion than the carbon sheel.These substances upon combustion have a high illumi-nating value, the consumption of the arcs being .3 wattsper candle. Owing to the…
Electricity · Electrical engineering
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