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 237
r each 16-candlepowerlamp, to produce this illumination. TABLE V. Square feet perlamp, lamps fourfeet above object. Halls 1 to 3 candle feet 60 to 20 Reading 1 to 3 candle feet 60 to 20 Desk ... 2 to 4 candle feet 30 to 15 Book keeping 2 to 4 candle feet 30 to 15 Clothing stores 4 to 6 candle feet… … 30 15 Figure 145 With an incandescent lamp the light is not givenout uniformly 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.…
Electrical engineering · Electric testing
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