Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 333
inadequate productionof glassware in this country has mitigatedagainst rapid progress. With reference to the question of theaverage annual demand for variouseandlepowei>. a set of curves is presented,showing the annual demand for eachcandlepower. both vacuum type andgas-filled, for the past five… … •5yU -6/j. WAVE LENGTH Fig. 2.—Showing distribution of energy throughout the spectrum from A. Blue Sky, B(1, 2 and 3), Artificial Daylight, C, Noon Sunlight, and D, Tungsten Lamp. THE ILLUMINATING ENGINEEB (nov. 1919) 323 RECENT DEVELOPMENTS IN ILLUMINATINGENGINEERING. (Exhibits shown at the…
Lighting
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