Gyroscopic apparatus

Claim 1

GYROSCOPIC APPARATUS COMPRISING A CASE, A SUPPORT IN SAID CASE, AN ELECTRICITY CONDUSTIVE STRING STRETCHED BETWEEN AND SECURED AT TWO POINTS THEREOF TO SAID SUPPORT, DRIVE MEANS FOR CAUSIING SAID STRING TO VIBRATE IN A PLANE AT A PREDETERMINED FREQUENCY, A MAGNETIC FIELD STRUCTURE ASSEMBLY MOUNTED TO SAID CASE, SAID ASSEMBLY COMPRISING AN OUTER SHELL MOUNTED TO THE CASE FOR ROTATION ABOUT THE AXIS OF THE STRING AND FIRST AND SECOND MUTUALLY ORTHOGONAL PAIRS OF DIAMETRICALLY OPPOSED CORE MEMBERS FIXED TO THE SHELL AND DIRECTED RADIALLY INWARDLY THEREOF, FIRST AND SECOND COILS ON THE CORE MEMBERS OF ONE OF THE PAIRS, SAID ONE OF THE PAIRS BEING DIRECTED ALONG AN AXIS LYING SUBSTANTIALLY IN SAID STRING VIBRATION PLANE AND NORMAL TO THE LONGITUDINAL AXIS OF SAID STRING, THIRD AND FOURTH TORQUING COILS ON THE CORE MEMBERS OF THE OTHER PAIR, A SOURCE OF ALTERNATING POTENTIAL CONNECTED WITH THE FIRST COIL, A SOURCE OF FIXED POTENTIAL CONNECTED WITH THE SECOND COIL, A SWITCH ALTERNARIVELY CONNECTING FIRST OR SECOND COIL, A SWITCH SAID TORQUING COILS, A VARIABLE POTENTIAL SOURCE COUPLED TO ONE OF SAID TERMINALS, A PAIR OF CAPACITATIVE PICKOFF PLATES MOUNTED ON INNER ENDS OF THE CORE MEMBERS OF ONE OF SAID PAIRS IN CLOSE PROXIMITY TO THE STRING, A SENSING AMPLIFIER HAVING AN INPUT COUPLED TO THE STRING, A FIRST DEMODULATOR PHASE REFERENCED FROM SAID LAST MENTIONED PICKOFF PLATES AND HAVING AN INPUT FROM SAID SENSING AMPLIFIER, A SECOND DEMODULATOR PHASE REFERENCED FROM SAID SOURCE OF ALTERNATING POTENTIAL AND HAVING AN INPUT FROM SAID FIRST DEMODULATOR, THE OUTPUT OF SAID SECOND DEMODULATOR PROVIDING AN INDICATION OF THE RELATION BETWEEN THE SUPPORT OF THE PLANE OF VIBRATION OF THE STRING, AND AN OUTPUT OF SAID SECOND DEMODULATOR BEING CONNECTED WITH THE SECOND SIGNAL TERMINNAL.