A 35 mm high-speed cinematograph camera
W. Deryck Chesterman, D T Myers · Journal of Scientific Instruments · 1951
A 35 mm high-speed cinematograph camera is described which takes full-size pictures at repetition rates from 100 to 2 000 per sec. Film capacity is 200 ft and films taken can be projected in the normal way. Optical compensation for the film movement during exposure is provided by a rotating cubical glass prism interposed between objective and film. For half-height pictures an octagonal glass prism is used and the maximum repetition rate is then 4 000 p/s. The instrument can be used with either continuous light on the subject or synchronized with the flashing light source of a high-speed power stroboscope. Removal of the image compensator permits the camera to be used as a high-speed film chronograph with a film transport speed of 125 ft/sec. Optical arrangements are made for the simultaneous photography of a cathode-ray oscillograph trace on part of the picture area. 1 000 c/s timing marks are given on the film edge.