TransactionsPublished under the care of the General Secretary and the Treasurer . ior circuit. Magnesium Valve. Fig. 2 shows the phase displacement of the current with referenceto the potential difference. The valve is made of an anode ofmagnesium, a cathode of graphite, and an electrolyte of ammoniumfliinridp. 518 NODON: ELECTROLYTIC RECTIFIERS. Difference of Potential at the Terminals of a Valve. Fig. 3 is obtained with a valve made with an anode of pure alu-minum, a cathode of surface about 100 times as great, formed ofaluminum alloyed with 10 per cent copper, and with an electrolyteof ammo
TransactionsPublished under the care of the General Secretary and the Treasurer . ior circuit. Magnesium Valve. Fig. 2 shows the phase displacement of the current with referenceto the potential difference. The valve is made of an anode ofmagnesium, a cathode of graphite, and an electrolyte of ammoniumfliinridp. 518 NODON: ELECTROLYTIC RECTIFIERS. Difference of Potential at the Terminals of a Valve. Fig. 3 is obtained with a valve made with an anode of pure alu-minum, a cathode of surface about 100 times as great, formed ofaluminum alloyed with 10 per cent copper, and with an electrolyteof ammonium carbonate. V= difference of potential between terminals of valve on opencircuit = 69 volts. TJ = difference of potential in operation ^ 89 volts. / = strength of rectified current = amperes. Influence of the Nature of the Cathode. Graphite used for the cathode disintegrates slowly. Iron be-comes coated with an adherent coating of iron phosphate andalumina, which increases the resistance. A sheet of polishedsteel is but slightly attacked. Lead becomes covered with lead. •; l; J :/? i f Fig. 3. peroxide which protects the metal. The alloys of aluminum con-taining from 8 to 10 per cent copper and 5 per cent nickel sufferno sensible attack, but the output is less than with lead or steel. Condensation at the Opening of the Valves. In a single valve of aluminum the electrolytic hysteresis has. avalue higher than unity with the alternating current. The persis-tance of the film of dielectric, during a portion of the inverse halfcycle, results in very noticeably augmenting the internal resistanceof the cell. Influence of Self-Inductive Circuit. It may be demonstrated that the effective current. 7 _, of an eii alternating current must be equal to the ratio existing between thepotential difference, 1^,^. between the plates of a condenser and the NODOy: ELECTROLYTIC RECTIFIERS. 519 ohmic resistance, B, of the exterior circuit, /^^j =^ eff* ^^ ^^^^ P^^ticular case when this effec
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Keywords: ., bookcentury1900, bookdecade1900, bookidtr, booksubjectelectricity
