Electric heater assembly for simultaneously heating a pair of vessels

Claim 1

AN ELECTRIC HEATER ASSEMBLY, COMPRISING A CYLINDRICAL WALL, A CYLINDRICAL REFRACTORY RING SUPPORTED WITHIN SAID WALL IN AXIAL ALIGNMENT THEREWITH BETWEEN ENDS OF SAID WALL, SAID RING HAVING A GROOVE IN ONE SIDE THEREOF, A COILED RESISTANCE HEATER WIRE IN SAID GROOVE, AND AN ELECTRICAL CONNECTOR EXTENDING OUTWARDLY THROUGH SAID WALL FOR CONNECTION OF AN EXTERNAL POWER SUPPLY THERETO, SAID CONNECTOR HAVING SOCKET TERMINALS EXTENDING RADIALLY INWARD OF SAID WALL, OPPOSITE ENDS OF SAID WIRE BEING CONNECTED TO SAID SOCKET TERMINALS RESPECTIVELY, SAID RING HAVING A CENTRAL HOLE WITH A LEDGE FORMED THEREIN; A SECOND CYLINDRICAL WALL REMOVABLY SEATED ON SAID LEDGE IN SAID RING, A SECOND CYLINDRICAL REFRACTORY RING SUPPORTED WITHIN SAID SECOND WALL IN AXIAL ALIGNMENT THEREWITH, SAID SECOND RING HAVING A SECOND GROOVE IN ONE SIDE THEREOF, A SECOND COILED RESISTANCE HEATER WIRE IN SAID SECOND GROOVE, A SECOND ELECTRICAL CONNECTOR EXTENDING OUTWARDLY THROUGH SAID SECOND WALL AND DETACHABLY ENGAGED WITH THE SOCKET TERMINALS OF THE FIRST-NAMED CONNECTOR, WHEREBY SAID SECOND WALL AND RING ARE REMOVABLE FROM THE FIRSTNAMED RING THROUGH SAID CENTRAL HOLE, SAID SECOND WIRE HAVING OPPOSITE ENDS CONNECTED TO THE SECOND CONNECTOR, WHEREBY POWER APPLIED TO THE FIRST-NAMED CONNECTOR ENERGIZES THE RESISTANCE HEATER WIRES IN THE FIRST AND SECOND RINGS.