Alternate function vor-loc aircraft meter circuit

Claim 1

IN AN ALTERNATE FUNCTION SYSTEM FOR INSTRUMENTATION HAVING A DIFFERENCE INDICATING METER MOVEMENT AND AN OUTPUT VOLTAGE SUM RESPONSIVE METER MOVEMENT; A SIGNAL SOURCE; MEANS FOR TUNING SAID SIGNAL SOURCE FOR AT LEAST TWO INDEPENDENT FUNCTION SIGNALS; FIRST MEANS RESPONSIVE TO AT LEAST A FIRST FUNCTION SIGNAL OF SAID SIGNAL SOURCE, AND PROVIDING A FIRST FUNCTION RECTIFIED OUTPUT; SECOND MEANS RESPONSIVE TO AT LEAST A SECOND FUNCTION SIGNAL OF SAID SIGNAL SOURCE, AND PROVIDING A SECOND FUNCTION RECTIFIED OUTPUT; THE FIRST FUNCTION MEANS AND THE SECOND FUNCTION MEAN EACH HAVING TWO RECTIFYING OUTPUT PORTIONS; BOTH RECTIFYING OUTPUT PORTIONS OF EACH FUNCTION MEANS HAVING RECTIFYING DEVICES SO ORIENTED THAT A POSITIVE AND A RELATIVELY NEGATIVE DIRECT CURRENT OUTPUT IS PROVIDED AT TWO OUTPUT TERMINALS OF BOTH RECTIFYING OUTPUT PORTIONS WHENEVER THE SIGNAL OF THE RESPECTIVE FUNCTION MEANS IS BEING APPLIED; VOLTAGE DIVIDING MEANS CONNECTED BETWEEN TERMINALS OF OPPOSITE POTENTIAL OF THE TWO RECTIFYING PORTIONS OF EACH FUNCTION MEANS; SAID DIFFERENCE INDICATING METER MOVEMENT BEING CONNECTED BETWEEN TWO VOLTAGE DIVIDING MEANS OF EACH FUNCTION MEANS; AND SAID OUTPUT VOLTAGE SUM RESPONSIVE METER MOVEMENT BEING CONNECTED BETWEEN A POSITIVE TERMINAL OF ONE RECTIFYING PORTION AND A RELATIVELY NEGATIVE TERMINAL OF THE OTHER RECTIFYING PORTION OF BOTH FUNCTION MEANS IN PARALLEL.