Bridge circuit control means with ganged switches effecting leakage compensation

Claim 1

A SWITCH CONSTRUCTION SUITABLE FOR USE IN A MOIST ENVIRONMENT COMPRISING A PAIR OF SWITCHES, MEANS MECHANICALLY INTERCONNECTING SAID SWITCHES WHEREBY WHEN ONE SWITCH IS CLOSED THE OTHER IS OPEN AND VICE VERSA, A FOURCORNERED ELECTRIC BRIDGE CIRCUIT INCORPORTATING SAID SWITCHES RESPECTIVELY BETWEEN THE FIRST AND SECOND AND THE FIRST AND FOURTH CORNERS AND INCLUDING IMPEDANCE ARMS BETWEEN THE SECOND AND THIRD AND THE THIRD AND FOURTH CORNERS, MEANS APPLYING A DIRECT CURRENT POTENTIAL ACROSS THE FIRST AND THIRD CORNERS, A TRANSISTOR HAVING A BASE, A COLLECTOR, AND AN EMITTER, MEANS CONNECTING SAID BASE TO THE SECOND CORNER OF SAID BRIDGE CIRCUIT, MEANS CONNECTING THE EMITTER TO THE FOURTH CORNER OF SAID BRIDGE CIRCUIT, DIRECT CURRENT POWER SUPPLY MEANS FOR SAID TRANSISTOR CONNECTED TO SAID EMITTER AND SAID COLLECTOR, AND CONTROLLED MEANS INCORPORTED BETWEEN THE TRANSISTOR DIRECT CURRENT