Sound Film Printing—II

J. Crabtree

The production of sound-film prints from variable density negatives by the Model D Bell & Howell printer has been studied from the point of view of high-frequency response and uniformity of product. The account of this study, begun in Part I1, is continued here, with particular reference to the degree of influence of slippage on the high-frequency response, occasioned particularly by non-conformity of the perforation pitch of the negative and positive films. It is found that to improve printing conditions in practice, it is first necessary to achieve consistency in the pitch of the processed negative and positive materials and to make the pitch of the processed negative 0.0004 inch less than that of the positive raw stock.

Print ISSN
Published
1934-02
Content type
Original Research
DOI
10.5594/J07459