High-Speed Motion Picture Photography Applied to Design of Telephone Apparatus
W. Herriott · Journal of the Society of Motion Picture Engineers · 1938
High-speed motion pictures are employed at Bell Telephone Laboratories as a visual aid in the study of problems associated with the design, manufacture, and testing of telephone apparatus. A new high-speed camera of the optical compensator type operating at 4000 pictures per second is described, and its application to the study of problems associated with telephone apparatus is discussed.