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 194
are cast by the lamp frame. The relative candlepow-ers at other positions are shown by the length of theradial lines from the center to the curve in the figure. With alternating current arcs the carbons are al- 192 Operating and Testing ternately positive and negative, and the distributionof light… … Figure 130 the maximum light is thrown out at different angles.Figure 131 shows the distribution of light from anopen, alternating current arc. It will be seen thatthere are two points of maximum candlepower, one at40° below the horizontal and the other at 40° abovethe horizontal. Arc Lamps 193 It…
Electrical engineering · Electric testing
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