Electrical connections between relatively rotating electrical conductors

Claim 1

AN ELECTRICAL CONNECTION FORMED BETWEEN RELATIVELY ROTATABLE INNER AND OUTER CONDUCTORS COMPRISING SURFACES DEFINING AN ANNULAR SPACE EXTENDING BETWEEN SAID CONDUCTORS, A LIQUID METAL FILLING TO SAID ANNULAR SPACE FORMING A CONTINUOUS ELECTRICAL CONNECTION BETWEEN SAID CONDUCTORS, A SEAL ON EACH SIDE OF SAID ANNULAR SPACE, EACH SEAL BEING FORMED BY RELATIVELY ROTATABLE INNER AND OUTER SEALING MEMBERS HAVING CO-ACTING SURFACES OF A MATERIAL WHICH IS NOT WETTED BY THE LIQUID METAL, MEANS FOR SUPPLYING LUBRICANT TO THE CO-ACTING SURFACES OF SAID SEALING MEMBERS AND A SUPPLEMENTAL CHAMBER PARTIALLY FILLED WITH SAID LIQUID METAL AND COMMUNICATING WITH SAID ANNULAR SPACE TO APPLY A STATIC PRESSURE THERETO, SAID CHAMBER INCLUDING MEANS FOR VARYING SAID STATIC PRESSURE.