Electricians' operating and testing manual; a hand book for men in charge of electrical apparatus, repair men, trouble men, lamp trimmers, and electricians generally (1916)
Horstmann, Henry Charles, Tousley, Victor Hugo, 1875- joint author · Chicago, F.J. Drake & co · leaf 241
ndlepowerlamp, 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 15 to 10… … 60* 60 45 JO 15 0 /5° JO 45^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…
Electrical engineering · Electric testing
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