Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 143
Fig. 5.—Distribution curve of incandescentmantle and mantle in enamelled steel reflector. 180 160 140 120 100 80 li > Fig. 7.—Distribution curve of incandescentmantle and mantle in green cased opal glassshade. … 80 Bare mantle100 Fig.mantle
Lighting
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