Advanced Stereometrograph model G with novel fast motion

Photogrammetric stereoplotters can be run more rapidly than usual whenever a movement is not intended for coordinate measurement. The Stereometrograph plotter was furnished with a fast drive by using the selsyns already provided in the plotter as motors, so no extra motors were required. Traversing speed in the photoplane is 30 mm/sec. Unlike freehand moving facilities, the motor drive can be employed for coordinate recording as well.