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 297
ken at the different positionswe can obtain a curve of the illumination throughout Testing 295 one whole side of the lamp. At each change of posi-tion the candlepower must be measured and markedoff on the radial line in Figure 179 that correspondswith the position of the lamp. When all of these… … Figure 179 the board upon which the lamp lies should be paintedblack, so there may be no reflection. When comparative teste are made care should betaken that the filaments of the lamps tested are aboutalike. An accurate comparison of different lamps re-quires the taking of complete curves as in…
Electrical engineering · Electric testing
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