Thickness measuring gauge comprising a radioactive source and solid state radiation detector

Claim 1

APPARATUS FOR GAUGING A CHARACTERISTIC COMPRISING: MEANS, INCLUDING SOLID STATE NUCLEONIC RADIATION DETECTING MEANS, FOR PROVIDING OUTPUT PULSES VARYING IN NUMBER ACCORDING TO THE QUANTITY OF NUCLEONIC RAYS REACHING SAID DETECTING MEANS, SAID DETECTING MEANS INCLUDING A SOLID STATE RADIATION SENSITIVE CAPACITOR, MEANS, INCLUDING A NUCELONIC RADIATION SOURCE HAVING ITS RAYS DIRECTED TOWARD SAID DETECTING MEANS, FOR VARYING THE QUANTITY OF SAID RAYS REACHING SAID DETECTING MEANS IN ACCORDANCE WITH VARIATIONS IN SAID CHARACTERISTIC, AND MEANS OPERATIVE ON SAID OUTPUT PULSES TO INDICATE THE VARIATIONS IN SAID CHARACTERISTIC, SAID OUTPUT PROVIDING MEANS INCLUDING AN OSCILLATOR COMPRISING SAID CAPACITOR AND VARIABLE IN FREQUENCY WITH VARIATIONS IN CAPACITANCE OF SAID CAPACITOR TO PROVIDE SAID VARYING-NUMBER PULSES.