Evaluation device for an exposure meter

Claim 1

IN COMBINATION WITH AN EXPOSURE METER FOR PHOTOGRAPHIC PURPOSES, A PLURALITY OF SCALES, AT LEAST SOME OF WHICH ARE ARRANGED ON DIFFERENT SCALE OF THE METER, A FIRST MOVABLE WITH RESPECT TO ONE ANOTHER, A TRANSPARENT ELEMENT ENTIRELY COVERING ALL THE SCALES OF THE METER, A FIRST SCALE CARRIER OF SAID SCALE CARRIERS BEING ARRANGED AT THE BACK SIDE OF SAID ELEMENT, SAID TRANSPARENT ELEMENT BEING MOUNTED MOVABLY AND REMOVABLY ON THE METER FOR MOVEMENT TOGETHER WITH SAID FIRST SCALE CARRIER WITH RESPECT TO THE OTHER SCALE CARRIERS, A SECOND SCALE AND A THIRD SCALE CARRIER, SAID SCALE CARRIERS BEING MOVABLE ONE WITH RESPECT TO THE OTHER FOR SETTING THE EXPOSURE METER TO VARIOUS SENSITIVITIES OF PHOTOGRAPHIC MATERIALS TO BE USED, THE SETTING OF SAID SECOND AND THIRD SCALE CARRIERS BEING POSSIBLE ONLY WHEN SAID TRANSPARENT ELEMENT IS REMOVED, AND BEING COMPLETELY PREVENTED WHEN SAID ELEMENT IS IN PLACE OF OPERATION, SAID TRANSPARENT ELEMENT BEING A DIAL HAVING A PERIPHERAL COLLAR PROJECTING BACKWARDS AND SURROUNDING THE PERIPHERIES OF ALL THE SCALE CARRIERS, AND A FIXED STUB ARRANGED ON THE METER, SAID TRANSPARENT ELEMENT HAVING A CENTRAL PORTION WHICH IS ROTATABLY AND DETACHABLY MOUNTED ON SAID STUB, COOPERATING PORTIONS OF SAID TRANSPARENT ELEMENT AND SAID STUB BEING MADE AND ASSEMBLED IN THE MANNER OF A SNAP FASTENER.