Cinematographic annual : 1930 (1930)

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REPRODUCTION IN THE THEATRE 403 iently adjusting the position of this lamp are made because it is desirable that its position be such that the reproducing beam has the maximum amount of light possible in it. When a film is run through the light beam, a beam of vary FIGURE 2 RCA Photophone sound head attached to Simplex Projector. ing intensity falls upon the active part of the photocell. These variations are to be converted into electrical impulses. The RCA