Automatic zeroing assembly for cameras

Claim 1

IN A CAMERA WHICH IS AT LEAST SEMI-AUTOMATIC, IN COMBINATION, MANUALLY OPERABLE CORRECTING MEANS MOVABLE FROM A ZERO POSITION TO A SELECTED CORRECTION POSITION FOR INTRODUCING A CORRECTION FACTOR WHEN PHOTOGRAPHING A SUBJECT OF EXTREME CONTRAST; HOLDING MEANS OPERATIVELY CONNECTED TO SAID CORRECTING MEANS FOR RELEASABLY HOLDING THE LATTER IN A SELECTED CORRECTION POSITION; ZEROING MEANS INCLUDING AT LEAST ONE SPRING WHICH WHEN SAID CORRECTING MEANS IS PLACED IN A SELECTED CORRECTION POSITION IS STRESSED FOR URGING SAID CORRECTING MEANS BACK TO SAID ZERO POSITION THEREOF, SAID HOLDING MEANS RELEASABLY HOLDING SAID CORRECTING MEANS IN A SELECTED CORRECTION POSITION IN OPPOSITION TO SAID ZEROING MEANS; MANUALLY OPERABLE MOVING MEANS ACTUATED BY THE OPERATOR PREPARATORY TO MAKING ANOTHER EXPOSURE IMMEDIATELY FOLLOWING THE EXPOSURE FOR WHICH SAID CORRECTING MEANS WAS PLACED IN A SELECTED CORRECTION POSITION, SAID MANUALLY OPERABLE MOVING MEANS FORMING PART OF A STRUCTURE FOR MOVING THE NEXT FILM FRAME IN POSITION TO BE EXPOSED, SAID MOVING MEANS HAVING A PORTION WHICH ENGAGES SAID HOLDING MEANS, MOVES THE LATTER TO A POSITION RELEASING SAID CORRECTING MEANS TO SAID ZEROING MEANS TO BE RETURNED THEREBY TO SAID ZERO POSITION, AND THEN MOVES AWAY FROM SAID HOLDING MEANS SO THAT THE LATTER WILL AGAIN RELEASABLY HOLD THE CORRECTING MEANS IN A SELECTED CORRECTION POSITION, WHENEVER SAID MOVING MEANS IS ACTUATED PREPARATORY TO MAKING THE NEXT EXPOSURE; SETTING MEANS FOR SETTING INTO THE CAMERA THE FACTOR OF FILM SPEED; AND CLUTCH MEANS INTERCONNECTING SAID SETTING MEANS AND CORRECTING MEANS, SAID CLUTCH MEANS WHEN ENGAGED TRANSMITTING MOVEMENT OF SAID SETTING MEANS TO SAID CORRECTING MEANS AND WHEN DISENGAGED PROVIDING FREE MOVEMENT OF SAID CORRECTING MEANS RELATIVE TO SAID SETTING MEANS.