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History and Present Position of High-Speed Photography in Great Britain
By W. DERYGK GHESTERMAN
The history of high-speed photography in Great Britain is outlined, beginning with intermediate-rate cameras, defined as those in which the film is transported continuously through the camera mechanism at speeds not exceeding 40 m/sec. Then follows a survey of drum cameras, in which a single loop of film is transported at speeds up to 240 m/sec on a rotating drum, or where images are swept along the stationary film at this rate by moving optical parts. Recent developments in light sources of short duration are discussed and the review concludes with a description of some research studies in zoological, biological and medical sciences, and some recent military applications.
J_ HE TERM HIGH-SPEED PHOTOGRAPHY
is now generally used to cover a wide range of observational techniques in which photographic images are recorded to examine the sequence of happenings in a rapid event. Sometimes a series of pictures is produced for subsequent cinematographic projection, or alternatively, separate individual pictures permit study of a repetitive motion of a repeatable event, by subsequent analysis. It is convenient to classify the methods both by the repetition rate of taking pictures and by the individual picture exposure time. Each of these fundamental variables is of vital importance to the camera designer and to
Presented on October 9, 1952, at the Society's Convention at Washington, D.C., by W. D. Chesterman, Royal Naval Scientific Service, Admiralty, London, England.
the research worker who uses the observational tool which has been devised. The progress of high-speed photography in Great Britain, as in Europe and the United States, may be considered as a search for methods of higher repetition rate together with ever shorter exposure times. It is always most desirable, but also difficult, to maintain the highest picture quality while improving these other variables.
Intermediate-Rate Cameras
In the present paper we shall deal first with intermediate-rate cameras, or those in which the film is transported continuously through the camera mechanism at speeds of less than 40 m/sec. These cameras are of two categories — those in which the film is moved intermittently and is stationary at the time of exposure, and those in which the film moves continuously at a high rate, the images being optically stabilized on the
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March 1953 Journal of the SMPTE Vol. 60