Oscillator using a semi-conductor controlled rectifier capable of being switched on and off at its gate

Claim 1

AN OSCILALTOR COMPRISING IN COMBINATION A D.C. SOURCE PROVIDING A POSITIVE TERMINAL AND A NEGATIVE TERMINAL, POTENTIOMETER MEANS CONNECTED TO SAID SOURCE AND PROVIDING A POINT OF POTENTIAL INTERMEDIATE SAID POSITIVE AND SAID NEGATIVE POTENTIAL, A SWITCHABLE RECTIFIER HAVING AN ANODE, A CATHODE, AND A GATE, SAID SWITCHABLE RECTIFIER BEING SWITCHED ON BY A POSITIVE VOLTAGE APPLIED BETWEEN ITS GATE AND CATHODE, AND BEING SWITCHED OFF BY A NEGATIVE VOLTAGE APPLIED BETWEEN ITS GATE AND CATHODE, THE ANODE OF SAID SWITCHABLE RECTIFIER BEING CONNECTED TO SAID POSITIVE TERMINAL, A LOAD THROUGH WHICH THE CATHODE OF SAID SWITCHABLE RECTIFIER IS CONNECTED TO SAID NEGATIVE TERMINAL, AND AN INDUCTOR THROUGH WHICH SAID GATE IS CONNECTED TO SAID POINT, POSITIVE CURRENT FLOWING THROUGH SAID INDUCTOR TO SAID GATE TO SWITCH ON THE SWITCHABLE RECTIFIER WHEN THE CURRENT HAS BUILT UP TO A PREDETERMINED LEVEL, AND THE CATHODE OPF SAID SWITCHABLE RECTIFIER RISING TO SAID POSITIVE POTENTIAL WHEN THE SWITCHABLE RECEIFIER IS ON, NEGATIVE CURRENT THEN FLOWING THROUGH SAID INDUCTOR UNTIL THE CURRENT BUILDS UP TO A LEVEL AT WHICH SAID SWITCHABLE RECTIFIER IS SWITCHED OFF.