j-(c The i\Torlt. l!KM. 1 1:i.f. cit.

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* " The Theory of Decay in Radiosctive Luminous Compounds," J. W. T b Walsh; * A very similw appxratuhwcwi dcucrilxd by Xr. Bluk t o the Illuminatiiiy Engineering gooiuty, March, 1917.

Assuming a ratio ofof 0.85 end 0.79 fo; carbon and tungsten filaments respectively, the approximate watts per candle me obtained for any value of lumens per matt by dividing the lattcr into 10.7 for carbon slament lamps, and 10.0 for tungst,en filament lamps.