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 296
ower 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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