TECHNES Encyclopedia Database

Indeed before automatic synchronism during the film shoot was perfected, the speed of the equipment was only regulated; this system, which acted like a potentiometer, made it possible to speed up or slow down the motor, but this method had too much inertia. The manufacturers of magnetic tape recorders made use of an electromagnetic principle, shifting to electronic in 1958 with the Nagra III. At the same time, camera motors were equipped with a tachometric dynamo, whose underlying principle was to send an electrical impulse to each image.