Electricians' operating and testing manual; (1910)
Horstmann, Henry C. [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. H. Drake & co · leaf 238
y in all directions, The distribution of 236 Operating and Testing light from a 20-candlepower metallized filamentlamp is shown in Figure 145, where the candle-power taken at various angles in a vertical planeare plotted. The concentric circles represent the can-dlepower marked on them The curve of… … 30 15 0 15 Figure 146 30 in a horizontal direction while, as a general rule, thegreatest light is desired below the lamp. By the useof suitable reflectors almost any distribution of thelight desired may be obtained and the effect, so faras the candlepower at points below the lamp is con-cerned, is…
Electrical engineering · Electric testing
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