Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 147
—Distribution curve of bare tungstenlamp (1) and same lamp in white glass re-tiector (2) (bowl type). most pronounced focussing effect isobtained by mirrored glass, in whichdirect as opposed to scatteredreflection is the most important element.Compare with Figs. 9 and 10. Value of Exact Data on… … Fig. 16.— Distribution curve of barelamj) (1) and same lamp in white glass £ tungstenlobe (2).
Lighting
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