Automatic vehicle control apparatus

Claim 1

A SUPPLY CIRCUIT FOR SUPPLYING CURRENT OF A FIRST CHARACTER FROM A GENERATOR ACROSS A CONTROL WINDING RESPONSIVE ONLY TO SUCH CURRENT AND APPARATUS FOR CHECKING THAT SUCH CIRCUIT IS INTACT, SAID CONTACT AND APPARATUS COMPRISING; FIRST AND SECOND RESISTORS SO SELECTED THAT THE PRODUCT OF THE RESISTANCE OF THE FIRST RESISTOR AND THE RESISTANCE OF SAID CONTROL WINDING EQUALS TO PRODUCT OF THE RESISTANCE OF THE SECOND RESISTOR AND THE INTERNAL RESISTANCE OF SAID GENERATOR, SUCH COMPONENTS BEING CONNECTED SO THAT THEIR RESISTANCES FORM A BALANCED WHEATSTONE BRIDGE; A SOURCE OF CURRENT OF A SEOCND CHARACTER, A FIRST CIRCUIT CAPABLE OF CONDUCTING ONLY SAID CURRENT OF A SECOND CHARACTER AND CONNECTING SAID SOURCE OF CURRENT ACROSS FIRST OPPOSITE JUNCTION POINTS OF THE ARMS OF SAID BRIDGE, A CODE FOLLOWING RELAY HVING A CONTROL WINDING, A SECOND CIRCUIT CAPABLE OF CONDUCTING ONLY SAID CURRENT OF A SECOND CHARACTER AND CONNECTING THE CONTROL WINDING OF SAID RELAY ACROSS SECOND OPPOSITE JUNCTION POINTS OF THE ARMS OF SAID BRIDGE, A THIRD CIRCUIT CAPABLE OF CONDUCTING ONLY SAID CURRENT OF A SECOND CHARACTER AND CONNECTED TO INTERMITTENTLY SHUNT AT A SELECTED CODE RATE ONE ARM OF SAID BRIDGE; AND MEANS CONTROLLED BY SAID RELAY FOR INDICATING, WHEN THE RELAY IS FOLLOWING CODE AT SAID SELECTED CODE RATE, THAT SAID SUPPLY CIRCUIT IS INTACT.