Camera battery test indicator

Claim 1

IN A PHOTOGRAPHIC CAMERA HAVING A SOURCE OF ELECTRICAL POTENTIAL AND AN EXPOSURE CONTROL SYSTEM INCLUDING A PHOTORESPONSIVE ELEMENT ILLUMINATABLE BY SCENE LIGHT AND AN ELECTRIC MEASURING INSTRUMENT, MEANS FOR CONNECTING SAID INSTRUMENT ELECTRICALLY IN CIRCUIT WITH SAID ELEMENT, SAID INSTRUMENT HAVING A MOVABLE MEMBER, WHICH, WHEN SAID INSTRUMENT IS SO CONNECTED, IS DEFLECTABLE IN A FIRST DIRECTION AS A FUNCTION OF ILLUMINATION OF SAID ELEMENT, MEANS FOR MEASURING THE VOLTAGE OF SAID SOURCE COMPRISING: MEANS FOR SELECTIVELY CONNECTING SAID INSTRUMENT WITH SAID SOURCE TO DEFLECT SAID MEMBER IN A SECOND DIRECTION OPPOSITE SAID FIRST DIRECTION TO AN EXTENT DEPENDENT UPON THE VOLTAGE OF SAID SOURCE, MOVABLE TORQUE MEANS ADAPTED TO OPPOSE DEFLECTION OF SAID MEMBER IN SAID SECOND DIRECTION, SAID TORQUE MEANS COMPRISING RESILIENT MEANS HAVING A REFERENCE POSITION AND BEING BIASED TOWARD SAID REFERENCE POSITION, MEANS FOR MAGNETICALLY ATTRACTING SAID RESILIENT MEANS TOWARD SAID REFERENCE POSITION, AND MEANS LOCATED ON SAID DEFLECTABLE MEMBER ADAPTED TO ENGAGE SAID RESILIENT MEANS AND TO URGE SAID RESILIENT MEANS AGAINST SAID BIAS AND SAID MAGNETIC ATTRACTION WHEN SAID MEMBER IS DEFLECTED IN SAID SECOND DIRECTION, AND SCALE AND POINTER MEANS, ONE OF WHICH IS MOVABLE IN RESPONSE TO DEFLECTION OF SAID DEFLECTABLE MEMBER IN SAID SECOND DIRECTION FOR INDICATING THE VOLTAGE OF SAID SOURCE.