Signalling system having control means at both dispatch and remote stations connected through static inverter transformers

Claim 1

A SIGNALING SYSTEM CONSISTING OF A DISPATCH STATION AND A REMOTE STATION EACH HAVING SUPERVISORY CONTROL EQUIPMENT THEREIN FOR COMMUNICATING OVER A PAIR OF LINE WIRES: SIGNAL DETECTING MEANS COMPRISING A STATIC INVERTER INCLUDING A TRANSFORMER, SAID SIGNAL DETECTING MEANS BEING CONNECTED ACROSS THE LINE WIRES AT EACH OF THE DISPATCH STATION AND THE REMOTE STATION; A PAIR OF STATIC SWITCHES AT EACH OF THE DISPATCH STATION AND THE REMOTE STATION; SEPARATE DIRECT CURRENT ENERGY SOURCES AT SAID DISPATCH STATION AND AT SAID REMOTE STATION; ONE SWITCH OF EACH PAIR OF CONNECTING ONE LINE WIRE TO ONE POTENTIAL SIDE OF A DIRECT CURRENT ENERGY SOURCE AT ITS STATION AND THE OTEHR SWITCH OF EACH PAIR OF CONNECTING THE OTHER LINE WIRE TO THE OTHER POTENTIAL SIDE OF SAID DIRECT CURRENT SOURCE AT ITS STATION; INDEPENDENTLY OPERABLE CONTROL MEANS AT EACH STATION; INDEPENDENTLY OPERABLE CONTROL MEANS OF SWITCHES SIMULTANEOUSLY IN A FIRST DIRECTION FROM THE SAME ONE OF TWO STATES TO THE OTHER TO EFFECT THE SIMULTANEOUS CONNECTING OF THE SIGNAL DETECTING MEANS AT SAID DISPATCH STATION AND SAID REMOTE STATION TO THE ENERGY SOURCE AT WHICH EVER STATION OPERATES THE SWITCHES, SAID CONTROL MEANS AT EACH STATION BEING ALSO OPERABLE TO SWITCH A CORRESPONDING PAIR OF SWITCHES SIMULTANEOUSLY IN A SECOND DIRECTION FROM THE OTHER TO SAID SAME ONE OF SAID TWO STATES TO EFFECT THE SIMULTANEOUS DISCONNECTING OF THE SIGNAL DETECTING MEANS AT SAID DISPATCH STATION AND SAID REMOTE STATION FROM THE ENERGY SOURCE AT WHICHEVER STAATION OPERATED THE SWITCHES TO CONNECT THE SIGNAL DETECTING MEANS; AND SAID INVERTER TRANSFORMER ISOLATING THE SUPERVISORY CONTROL EQUIPMENT AND THE DIRECT CURRENT SOURCE AT SAID DISPATCH STATION AND AT SAID REMOTE STATION FROM THE LINE WIRES.