Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 146
nder-neath the lamp being characteristicof shallow pohshed reflectors of thiskind. A shallow reflector such as this,which intercepts only a smaU portion SHADES AND REFLECTORS. 133 of the light, has Httle influence on thedistribution curve. It has also thefurther drawback that an ordinarymetalhc… … these materials is due largely to directreflection off the shiny first surface.Fig. 18 is very interesting as showingthe gradual transition in diffusingpower as one passes from clear glassto opal. Taking the point immediatelybelow the source we see that the smallest Fig. 11.—Di.-tril)ution curve of…
Lighting
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