. The American annual of photography. Figure 3 This means, as a little reflection will show, that to get asgood an illumination with the cinema film as with the lanternslide nine times as much light will be needed, because thesame light has to be spread over a space nine times the a smaller film mask the difference is greater still. Itmust be remembered, also, that the whole of the light isavailable for the lantern, whereas in the ordinary type ofcinematograph a portion is lost through the intermittent inter-position of the shutter. Yet the amateur cinematographer is perpetually vent
. The American annual of photography. Figure 3 This means, as a little reflection will show, that to get asgood an illumination with the cinema film as with the lanternslide nine times as much light will be needed, because thesame light has to be spread over a space nine times the a smaller film mask the difference is greater still. Itmust be remembered, also, that the whole of the light isavailable for the lantern, whereas in the ordinary type ofcinematograph a portion is lost through the intermittent inter-position of the shutter. Yet the amateur cinematographer is perpetually ventilatinghis grievance, in very much the following style: I have alantern with a four-burner acetylene jet, and it gives a well-lit 82. THE ANCIENT PINE. Copyright by ANNE BRIGMAN. 83 picture about six ft. diameter. I have lately bought a cine-matograph attachment with lens, for use with the lantern, butcannot get a properly illuminated film picture more than twoft. wide. Why is this? Should the last two paragraphsmeet the eye of anyone thus perplexed, they will doubtlesssupply the solution of the mystery. Obviously, a perfect screen surface is more indispensablefor? cinema projection than with the ordinary lantern. Thehappy-go-lucky pinned-up sheet, which lets half the light passthrough, is of little use. A pure white, perfectly opaquescreen is needed, or else one of the new silver-surfaced smooth well-whitewashed wall is very near cinema halls, we far too often see a screen which ismore of a dubious grey than a white, to the manifest detri-ment of the pictures, as well as probable waste of current, orof oxygen, in a vain endeavour to better matters. A familiar law is much overlooked both by
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