Word: lamplight
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Dates: during 1900-1909
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Experiments are being conducted at the Observatory with a view to using the light of the stars as a standard of light in photography. It is the practice among manufacturers of photographic supplies to sensitize plates with lamplight of different degrees of brilliancy, and so the numbers of different makes of plates have no comparative significance. By this method, an unvarying standard of measurement will be obtained. The apparatus at the Observatory is very simple, consisting merely of a contrivance for allowing the light to shine through a small hole to the plate. A secondary and more convenient standard will...