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 300
r of the two lamps are as the square of their dis-tance from the paper. The illumination obtainable from a lamp variesgreatly with the angle at which the light is taken, andalso varies with the shape of the filament. It is fur-ther often purposely modified by the use of reflectors.In the… … Figure 178 the lamp. This can easiest be done by an arrangementoutlined in Figure 178. The lamp is fastened to astrip of wood hinged at one end so that it can beplaced in different positions from horizontal to verti-cal through a range of nearly 180 degrees. In the po-sition shown the light which…
Electrical engineering · Electric testing
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