. Fu;. I.âTHE ,\RE.^S OF THESE CONCENTRIC CIRCLES REPRESENT THE .\PPROXIM.\TE LUMINOUS EFFICIENCY OF V.^RIOUS SOURCES OF LIGHT, AS FOLLOWS : Source. " Ideal " Yellow-Green Light â â Ideal " White Light . Flame Arc I^amp Gas-liUed Tungsten Filament Lamp Vacuum Tuncjsten Filament Lamp Carbon Filament Lamp Caudle-power per Watt. 65 16 4-5 1-5-2 â 0-75-I . 0-25-0-35 sun. But Lummer,' working with an arc between carbon electrodesâthe same principle as that employed in arc lamps for street and shop lightmgâbut under very high pressure, is stated to have obtained a crater- - For a summ
. Fu;. I.âTHE ,\RE.^S OF THESE CONCENTRIC CIRCLES REPRESENT THE .\PPROXIM.\TE LUMINOUS EFFICIENCY OF V.^RIOUS SOURCES OF LIGHT, AS FOLLOWS : Source. " Ideal " Yellow-Green Light â â Ideal " White Light . Flame Arc I^amp Gas-liUed Tungsten Filament Lamp Vacuum Tuncjsten Filament Lamp Carbon Filament Lamp Caudle-power per Watt. 65 16 4-5 1-5-2 â 0-75-I . 0-25-0-35 sun. But Lummer,' working with an arc between carbon electrodesâthe same principle as that employed in arc lamps for street and shop lightmgâbut under very high pressure, is stated to have obtained a crater- - For a summary of these and other researches see Praktische Photometrie, by Dr. E. , pp. 43-55. 3 Lichtiechnik, by L. Bloch, p. 113.
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