Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 322
ly as the square of thedistance. In general, to get the illumination at any given *Watts per candle-power. ELECTRIC LIGHTING 311 point, the candle-power in the direction measured must bedivided by the square of the distance from the light to thepoint illuminated. When the surface illuminated is not… … Fis. 251 if a lamp (V) be placed 8 feet above the horizontal plane(H), as shown in Fig. 253, and it is desired to determinethe illumination at the point (B), 6 feet from the verticalline through the lamp, you should proceed as follows: Thedistance (I) the point (B) is from the lamp is equal to I =…
Electrical engineering
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