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

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1 42 12 26 25s yK / Vs ^ .yf / \ "V / / \ \ y J \ \ /* / \ *V ^n°, 1 \ _ . kc\° Du I \ 0U J. \ t X { x t \ i 1 \ f \ / V 7 1 . j l \ f \ on0 (X on' ZU U ^cU /I 1 1 1 K 18 20 Pt.IO 8 6 4 2 0 2 4 6 8 10 Ft. Fig. 16 Most favourable seating area for glass-beaded screens: — 20 ° ,, mat white ,, : — 500 does not fall off in brilliancy to the same extent as the silver screen. The angle of distortion is also smaller. For the best results the audience should be seated in an area roughly fan-shaped, with the outer seats on a line little more than 20° from the centre of the hall. The beaded screen is actually covered with a surface of minute particles of glass, and in theory, each particle is a perfect sphere, the inner surface of which acts in the manner of an aspherical reflector. This type of screen must never be wiped or wasned, and should always be returned to the manufacturer (or agent) for reconditioning. 76