A Displacement Meter for Testing Unsteadiness in Motion Picture Projectors

Ron W. Jones

There has been need for a simple device to measure with reasonable accuracy the degree of unsteadiness in 35-mm projector mechanisms, particularly where such mechanisms are overhauled and must be tested in a workshop. The following paper describes a simple technique which provides for an actual metering of the unsteadiness factor in terms of maximum displacement between any 2 frames during the running of a test film bearing on a suitable target.

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Published
1945-06
Content type
Original Research
DOI
10.5594/J14241