Stroboscopic display with sample-and-hold circuit

Claim 1

IN AN INDICATING SYSTEM, THE COMBINATION OF: MEANS FOR PRODUCING AN INDICATING SPOT; A COUPLING CIRCUIT COUPLED TO SAID SPOT PRODUCING MEANS; SAID COUPLING CIRCUIT COMPRISING: A NORMALLY DISABLED BRIDGE CIRCUIT HAVING FIRST AND SECOND PAIRS OF DIAGONALLY OPPOSED TERMINALS; MEANS FOR APPLYING AN INPUT SIGNAL TO ONE TERMINAL OF SAID FIRST PAIR OF TERMINALS; MEANS CONNECTED TO THE OTHER TERMINAL OF SAID FIRST PAIR FOR STORING A SIGNAL; FIRST MEANS CONNECTED BETWEEN THE TERMINALS OF SAID SECOND PAIR OF TERMINALS FOR APPLYING SAMPLING CONTROL SIGNALS, HAVING AMPLITUDES IN EXCESS OF A GIVEN AMPLITUDE, TO SAID BRIDGE; AND SECOND MEANS CONNECTED ACROSS THE SAID SECOND PAIR OF TERMINALS FOR APPLYING A CONSTANT BIAS POTENTIAL IN SERIES AIDING WITH THE SAMPLING CONTROL SIGNALS APPLIED BY SAID FIRST MEANS AND IN SHUNT CIRCUIT WITH SIGNALS CONVEYED BETWEEN SAID ONE AND SAID OTHER TERMINALS OF SAID FIRST PAIR RELATIVE TO SAID FIRST MEANS, FOR ESTABLISHING A BIAS BETWEEN SAID SECOND PAIR OF TERMINALS WHICH TENDS TO REDUCE THE SAID GIVEN AMPLITUDE ABOVE WHICH SAID CONTROL SIGNALS ARE TRANSFERRED BY SAID FIRST MEANS; AND