Universal obturator shutter
The construction and electrical circuit of a rotating photoshutter are described. The photoshutter can operate, using both stationary and expeditional astronomical instruments under one of three conditions: (1) short exposures from 0.01 to 0.06 sec, controlled by a mobile sector; (2) exposures from 1 sec and more, fixed by hand; and (3) exposures fixed by an electronic or electromechanical timer. The working aperture of the shutter is 150 x 150 mm.
Skorik, K. Y.↗