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 329
ired and the apparatus at hand. One ofthe simplest methods is that of turning on a number of16 candlepower lamps and then counting the numberof revolutions of the meter disk in a given time. Theload is estimated and the meter checked up by usingthe formula of the type of meter under test. As… … Figure 193 exactly ten revolutions in 36 seconds it would be reg-istering correctly. At best this method is only ap-proximate as the wattage of the lamps must be esti-mated and this will vary considerably with differentmakes of lamps and lamps of different ages. To make this test more accurate a…
Electrical engineering · Electric testing
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