Cine-film projection : a practical manual for users of all types of 16-mm. (1952)

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figure. The standard reading may be obtained by projecting with a new lamp, spotless optical-system, and with the auditorium clear of smoke. All standards set by the 16-mm. exhibitor as a guide to his own future efficiency must likewise be arranged and set under the most perfect of conditions. The time to measure, for instance, the reflective properties of a screen is when it is still new and as efficient as it ever will be. 83