Synchronized air-borne camera system

A method of taking aerial photographs with synchronized movie cameras has been developed at Northwestern University for the Navy. Films are exposed at the rate of 20 frames per second, and the cameras are synchronized to within ±0.002 second. The system includes: a plane-to-plane radio link for controlling equipment and relating data between two or more aircraft; a timing system for relating all data to an accurate time base; oscillograph recording for continuously checking the accuracy of the motor control system and for interpolating the data to a higher degree of accuracy if required; dial photography designed especially to obtain high illumination and satisfactory pictures of fast moving dials; film coding for marking the film of different cameras for matching.