Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 150
e light may match thatof the radium compound. The greenlight then falls on two screens SS, eachconsisting of two thicknesses of thin whitepaper with a space of lOmm.betweenthem.In front of the screens are placed twostencils TT, each consisting of a sheet ofthin brass or copper 03 mm. thick,framed… … Fig. 4.—The Earlj Portions of the LuminosityCurves for Samples of Compound contain-ing Radium in the proportion of 2 : 1. Fig. 5 shows a family of luminositycurves based on the average data atpresent obtained for compounds made upwith different proportions of radium. * The advantages of this…
Lighting
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