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LIGHTING IN THE SERVICE OF MANKIND
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air ports air-gas mixture air-gas ratio architectural artificial light black body brightness bulb burner candlepower candles per square carbon ceiling cent Coefficient of Utilisation colour daylight factor decoration determined diagram direction Distribution of Light effect efficiency electric lamps emitted energy fight floodlight foot-candles Gas Lighting gas mantle gasfilled lamp give given glare glass heat Illuminating Engineering important incandescent increased injector installation interior light distribution light output light sources lighting unit lumens luminous flux luminous intensity mantle maximum measure method mounting height object obtained orifice photometer Photometry plane polar curve possible practical pressure prisms produced radiation realise reduced reflection factor reflector refractor shown in Fig solid angle specific gravity spectrum square foot standard street lighting Table tion total flux tungsten velocity vertical visible visible spectrum visual acuity vitreous enamel voltage wavelength Welsbach mantle Welsbach mixture window zone