Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 155
the meanspherical candlepower. Effect of High Intrinsic Brilliancyof the Filament. The intrinsic brilliancy of gas-filledlamps, estimated at over 3,000 candle-power per square inch is three or fourtimes that of the tungsten filament in thevacuum lamp, and the intrinsic brilliancyof the latter was…
Lighting
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