Photographic slide projector

Claim 1

A SLIDE PROJECTOR COMPRISING MEANS DEFINING A CHANNEL FOR RECEIVING A SLIDE IN PROJECTION POSITION, MEANS FOR HOLDING A SLIDE MAGAZINE, MEANS FOR ENGAGING A MAGAZINE TO ADVANCE IT STEP BY STEP PAST SAID CHANNEL TO BRING SUCCESSIVE SLIDES IN SAID MAGAZINE INTO A POSITION ALINED WITH SAID CHANNEL, MEANS FOR ENGAGING A SLIDE IN SAID MAGAZINE ALINED WITH SAID CHANNEL AND MOVING SUCH SLIDE FROM SAID MAGAZINE INTO PROJECTION POSITION WITHIN SAID CHANNEL, COMMON DRIVE MEANS FOR CONCOMITANTLY DRIVING BOTH SAID MAGAZINE ENGAGING MEANS AND SAID SLIDE ENGAGING MEANS, SAID DRIVE MEANS INCLUDING A ROTARY SHAFT OPERATIVELY CONNECTED TO BOTH OF SAID ENGAGING MEANS, AN ELECTRIC MOTOR FOR DRIVING SAID SHAFT, A CAM ON SAID SHAFT AND ROTATING THEREWITH, AN ELECTRIC CIRCUIT EFFECTIVE TO CAUSE SAID MOTOR TO DRIVE SAID SHAFT WHEN SAID CIRCUIT IS ENERGIZED AND TO DISCONTINUE DRIVING OF SAID SHAFT BY SAID MOTOR WHEN SAID CIRCUIT IS NOT ENERGIZED, A FIRST SWITCH IN SAID CIRCUIT, SAID FIRST SWITCH BEING OPERATED BY SAID CAM IN SUCH MANNER THAT SAID FIRST SWITCH IS OPEN WHEN SAID SHAFT AND CAM ARE IN A PREDETERMINED REST POSITION AND SAID SWITCH IS CLOSED WHEN SAID SHAFT AND CAM ARE IN ANY OTHER POSITION, SECOND SWITCH MEANS FOR TEMPORARILY ENERGIZING SAID FIRST MENTIONED CIRCUIT INDEPENDENTLY OF SAID FIRST SWITCH, TO START ROTATION OF SAID SHAFT AND CAM SO THAT SAID FIRST SWITCH WILL CLOSE AND WILL KEEP SAID FIRST MENTIONED CIRCUIT ENERGIZED INDEPENDENTLY OF SAID SECOND SWITCH MEANS UNTIL SAID SHAFT AND CAM COMPLETE ONE CYCLE AND COME AGAIN TO SAID REST POSITION, AN ELECTRIC SOLENOID EFFECTIVE, WHEN ENERGIZED, TO REVERSE THE DIRECTION IN WHICH SAID MAGAZINE ENGAGING MEANS MOVES SAID MAGAZINE, AND AN ELECTRIC CIRCUIT FOR ENERGIZING SAID SOLENOID, SAID SECOND SWITCH MEANS COMPRISING A MANUALLY OPERATED SWITCH FOR ENERGIZING SAID SOLENOID CIRCUIT AND ANOTHER SWITCH OPERATIVELY CONNECTED TO SAID SOLENOID TO BE CLOSED WHEN SAID SOLENOID IS ENERGIZED, SAID OTHER SWITCH WHEN CLOSED SERVING TO ENERGIZE SAID FIRST MENTIONED CIRCUIT INDEPENDENTLY OF SAID FIRST SWITCH.