Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 106
> by lO-i amps, per foot-candle, but it has been found to be THE ILLUMINATING ENGINEER {march 1916) ds accurately proportional to the degree ofillumination of the metal surface over theextremely wide range of 0.01 to 620 foot-candles. Richtmyer, in America, haddescribed an ingenious null-method… … Flu. 2. -Connections for iisinL^ plmlo-clcctriccells on Wiiealstone Uriil^e principle (Mr. J.W. T. Walsh). 1*1 and \\y arc tlic < wo cells ami ej ande2 the two sources of potential the con-nected ends of which are of o]»[)osi<e})oIarity. The indicating instrument Kis a sensitive electrometer.…
Lighting
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