Transactions of the Society of Motion Picture Engineers (1929)

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64 Transactions of S.M.P.B., Yol. XIII, No. 37, 1929 points in the same phase in adjoining waves, e.g., the distance from the crest to crest. Wax — A soapy-metallic disc, one to two inches thick, on which the first impression of sound in the sound-on-disc process is cut. Wedge Spectrogram — ^A spectrogram made by photographing the spectrum through an optical wedge. Used either to indicate graphically the spectral sensitivity of emulsions or the spectral absorption of filters. Working Distance — The distance between an object and the nearest face of a lens forming an image of the object. Wow Wows — Change in pitch of the reproduced sound caused by sound film speed fluctuation in either recording or reproducing process. Also known as ' ' flutter. ' '