Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 267
ens per watt(approx. 1*25 watts per candle). Thedistribution of energy in the spectrumof the quartz tube mercury vapour lampis shown by the heavy vertical line at tometers to which materials to betested are exposed, provide a means forsubjecting various portions of a photo-graphic plate to… … Fio. 1.—Showing sensitiveness of photographic negative material (a) ; transmissionof glass (b) ; relative energy of source (c) ; and visibility curve (d) throughout the spectrum Hg and adjacent vertical lines of smallerordinates. Complete knowledge of the variousfunctions discussed above would,…
Lighting
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