Circular tuning fork timepiece

Claim 1

AN ELECTRONIC WATCH COMPRISING THE COMBINATION OF A HOUSING, A ROTARY INDICATING MCHANISM MOUNTED WITHIN SAID HOUSING, A SUPPORTING MEMBER MOUNTED ON SAID HOUSING, A CIRCULAR TUNING FORK COMPRISING A SPLIT CIRCULAR ANNULUS MADE OF A RESILIENT MATERIAL WITH THE SPLIT FORMING A PAIR OF OUTWARDLY CURVED TINES ADAPTED TO VIBRATE ALTERNATELY TOWARD AND AWAY FROM EACH OTHER AT A PREDETERMINED NATURAL FREQUENCY OF VIBRATION, SAID TUNING FORK BEING SECURED TO SAID SUPPORTING MEMBER AT A POINT DIAMETRICALLY OPPOSED TO SAID SPLIT WITH THE OUTWARDLY CURVED TINES OF THE TUNING FORK EXTENDING ALONG THE WALLS OF THE TIMEPIECE HOUSING AND AROUND THE ROTARY INDICATING MECHANISM, A BATTERY MOUNTED WITHIN THE SPACE BETWEEN THE OUTWARDLY CURVED TINES OF THE TUNING FORK SO AS TO FORM AN ANNULAR CHAMBER BETWEEN SAID BATTERY AND SAID CIRCULAR TUNING FORK, AN ARCUATE YOKE DISPOSED WITHIN SAID ANNULAR CHAMBER ADJACENT TO SAID BATTERY AND INCLUDING A PAIR OF MAGNETIC CORES EXTENDING RADIALLY TOWARD THE OPPOSED TINES OF SAID TUNING FORK, SAID CORES BEING SYMMETRICALLY ARRANGED WITH RESPECT TO SAID TINES, A PERMANENT MAGNET HAVING ONE POLE CONNECTED TO SAID SUPPORTING MEMBER AND THE OTHER POLE CONNECTED TO SAID YOKE FOR MAGNETIZING SAID CORES, AN ELECTRONIC CONTROL CIRCUIT CONNECTED TO SAID BATTERY AND MOUNTED WITHIN SAID ANNULAR CHAMBER FOR VIBRATING THE TINES OF SAID TUNING FORK, SAID CONTROL CIRCUIT INCLUDING A DRIVING COIL DISPOSED AROUND ONE OF SAID MAGNETIC CORES FOR APPLYING PERIODIC DRIVING IMPULSES TO THE TUNING FORK AND APPLYING PERIODIC DISPOSED AROUND THE OTHER OF SAID MAGNETIC CORES FOR PERIODIC TROLLING THE FREQUENCY OF SAID DRIVING IMPULSES IN RESPONSE TO THE VIBRATORY MOTION OF THE TUNING FORK, A PAIR OF ADDED MASSES ONE OF WHICH IS MOUNTED ON THE OTHER TINES AND THE OTHER OF WHICH IS MOUNTED ON ONE OF SAID OF SAID TINES, SAID ADDED MASSES AND SAID TUNING FORK BEING ADAPTED TO PROVIDE A SINGLE NODAL POINT IN THE VIBRATORY MOTION OF SAID FORK, SAID NODAL POINT BEING LOCATED AT THE POINT WHERE SAID TUNING FORK IS CONNECTED TO SAID SUPPORTING MEMBER, AND A ROTARY MEMBER OPERATIVELY ASSOCIATED WITH THE TINES OF SAID TUNING FORK FOR ROTATION IN ACCORDANCE WITH THE VIBRATION OF SAID TINES, SAID ROTARY MEMBER BEING COUPLED TO THE ROTARY INDICATING MECHANISM FOR DRIVING THE SAME.