. The American journal of roentgenology, radium therapy and nuclear medicine . J^O. Fig. 2. Fig. 3. direct resistance of the tube was found tobe very low, so as to give the tube a cor-respondingly high working efficiency. Thepotential required to break down thestarting resistance in the direction of thenormal operation of the tube was in theneighborhood of 1,000 volts, while a poten-tial of about 30,000 to 40,000 volts wasrequired to overcome the starting resist-ance of the tube in the reverse using multiple separated anodes insuch valve tubes, each anode may beconnected to a sepa
. The American journal of roentgenology, radium therapy and nuclear medicine . J^O. Fig. 2. Fig. 3. direct resistance of the tube was found tobe very low, so as to give the tube a cor-respondingly high working efficiency. Thepotential required to break down thestarting resistance in the direction of thenormal operation of the tube was in theneighborhood of 1,000 volts, while a poten-tial of about 30,000 to 40,000 volts wasrequired to overcome the starting resist-ance of the tube in the reverse using multiple separated anodes insuch valve tubes, each anode may beconnected to a separate source of polyphasehigh potential electricity, so as to allowperiodic current impulses to pass throughthe tube in the desired direction andsuperimpose through a single tube currentimpulses from a number of branches ofa polyphase circuit. Fig. 2 diagrammati-cally shows such an arrangement, tube34 being provided with the cathode ter- minal 35 and three separated anode ter-minals 36, 37, and 38, each connected toone of the branches 41, 42, and 43 of athree-phase high potential
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