Motion picture camera

Claim 1

IN A CAMERA HAVING EXPOSURE DIAPHRAGM BLADES OPERABLE TO VARIABLE EXPOSURE OPENINGS, MEANS FOR MANUALLY CONTROLLING THE APERTURE OPENING OF THE DIAPHRAGM BLADES, MEANS FOR AUTOMATICALLY CONTROLLING THE APERTURE OPENING TO THE DIAPHRAGM BLADES, THE MANUAL APERTURE CONTROLLING MEANS INCLUDING A SLIDE POSITIONABEL SELECTIVELY FROM EXTERNALLY THE CAMERA TO ONE OF THREE POSITIONS AND A MANUALLY ROTATABLE MEMBER, THE AUTOMATIC APERTURE CONTROLLING MEANS INCLUDING THE ROTATABLE COIL OF A GALVANOMETER, A VOLTAGE SOURCE AND A PHOTORESISTOR CONNECTED IN AN ELECTRIC CIRCUIT, A FIXED RESISTOR SERIALLY CONNECTED IN A PARALLEL CIRCUIT CONNECTABLE TO THE COIL OF THE GALVAOMETER AND THE VOLTAGE SOURCE, AND A SWITCHING MEANS SELECTIVELY POSITIONABLE BY THE SLIDE TO A FIRST POSTION IN WHICH THE CIRCUIT OF THE AUTOMATIC APERTURE CONTROLLING MEANS IS OPERATIVELY AUTOMATIC APERTURE CONTROLLING MEANS IS OPERATIVELY IS LOCKED AGAINST MOVEMENT MECHANICALLY BY THE SLIDE, TO A SECOND POSITION IN WHICH THE MANUALLY ROTATABLE MEMBER IS UNLATCHED FROM THE SLIDE WHILE THE AUTOMATIC APERTURE CONTROL MEANS CIRCUIT IS OPENED, AND A THIRD POSITION IN WHICH BOTH APERTURE CONTROL MEANS ARE INOPERATIVE AND THE FIXED RESISTOR, THE COIL OF THE GALVANOMETER AND THE VOLTAGE SOURCE ARE CONNECTED IN THE PARALLEL CIRCUIT TO MEASURE THE VOLTAGE VALUE OF THE SOURCE.