Excerpt from Journal of the Society of Motion Picture Engineers, Vol. 20: January, 1933
It has been the privilege of the authors to review the several hundred patents which have been granted on non - intermittent mo tion picture projectors. We have found that the problem of producing a satisfactory screen image from moving film by means of moving optical parts is not a simple one, and it seems desirable to discuss the difficulties encountered in the design of the several types of such projectors.
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