Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 402
bougie-meter and the candle-foot is shown in the annexed table : Boug-ie- IWEeter. Candle-power. Feet. Candle power. Feet. 0.1 1.058 8 9.45 0.5 2.37 10 10.58 0.8 3.0 20 14.95 1.0 3.34 50 23.7 1.5 4.1 100 33.4 2 4.73 200 47.3 3 5.8 500 74.8 4 6.69 1000 105.8 5 7.48 2000 149.5 Measurement of… … Fig. 1. Portable Bunsen Photometer. In all types let the following symbols mean the same. i — intensity of one light at the distance d.i% = intensity of the other light at the distance dv 390 ELECTRIC LIGHTING:. Rumfords photometer compares the shadows of an opaque rod thrownon a white screen by…
Electrical engineering
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