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 197
at40° below the horizontal and the other at 40^ abovethe horizontal. Arc Lamps 193 It is evident from the foregoing description that,to compare the light given out by arc lamps it wouldbe necessary to take into consideration the light givenout at all angles above and below the horizontal. Thisis… … Figure 131 maximum candlepower. For a lamp with a maximumcandlepower of 2,000, the mean spherical candlepowerwould be about 660. The accurate determination ofthe mean spherical candlepower is a rather difficultprocedure and requires the use of special apparatus.A better method of rating arc lamps…
Electrical engineering · Electric testing
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