Twentieth century hand-book for steam engineers and electricians, with questions and answers .. (1905)
Swingle, C. F. [from old catalog], Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] · Chicago, F. J. Drake & co. · leaf 610
th asgreat; therefore B is a 4 candlepower lamp. Care must ELECTRICITY FOR ENGINEERS 191 be taken that the two lamps are burning at just theproper voltage, otherwise the comparison will not beaccurate. Instruments of the kind just described aremade in a variety of different patterns, but their… … in front of it, but separated so that there will be twoseparate shadows cast, the two lamps to be compared.By moving one of the lamps away from, or closer to,the screen, at some point the two shadows will becomeof the same density. Now measure the distances of thetwo lamps from the screen, and…
