254 W. A. Anthony—Electro-magnetic Machine. 
The intensity of the light was determined by first compar- 
ing it with that of a coal-oil lamp and then comparing the 
latter with a standard candle. 
n all these experiments the machine was driven by a five 
horse power oil engine, known as. “ Brayton’s Ready Motor,” 
and the internal resistance of the machine too small, for the 
ion of the 
other pur 
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