Electrochemical and metallurgical industry . pro-jected until it crossesthe horizontal linerepresenting the zeroof alternating pres-sure, the nndirectionalvalue is 45^ of this pressureis probably producea by the chain alumin- fig. 2.— between direct andium - electrolvte - car- alternating-current The dotted line in the diagram represents the theoretical relation based uponthe assumption that there is perfect symmetry, that thereare no polarization pressures, and that the losses in thecell are zero. These pressure relations do not materiallyvary with any small ch
Electrochemical and metallurgical industry . pro-jected until it crossesthe horizontal linerepresenting the zeroof alternating pres-sure, the nndirectionalvalue is 45^ of this pressureis probably producea by the chain alumin- fig. 2.— between direct andium - electrolvte - car- alternating-current The dotted line in the diagram represents the theoretical relation based uponthe assumption that there is perfect symmetry, that thereare no polarization pressures, and that the losses in thecell are zero. These pressure relations do not materiallyvary with any small change in frequency, and since sucha cell can be easily set up, this scheme may be used for thepurpose of calibrating alternating-pressure instruments whereextreme accuracy is not desired. It is not necessary touse the zero method of Fig. 3 for the purpose of is merely necessary to connect the alternating-current in-struments across the cell terminals and the direct-current / // 1 / / V160 1) olts i J / / / / Volis. FIG. 3.—ARRANGEMENT OF EXPERIMENTS. instruments between the carbon (electrolyte) and one of thealuminium electrodes. The author then discussed what he calls unsymmetricalcondensers, /. c, aluminium condensers having two electrodeswith different electrostatic capacities. Their behavior wasfully discussed and analyzed graphicalh- and curves were shown of the different was shown that the unidirectional pressures across eachelectrode may be considerably greater than the impressed pres-sure. The behavior of the cell on alternating-current circuit is,notwithstanding its peculiarities, similar to two tinfoil con- Ci Ca densers in series. Tiie equivalent capacity is where Ci + Ci Ci and Ci are the electrostatic capacities of the films on the twoelectrodes. Two-phase and three-phase condensers were alsodiscussed, and the three-phase condenser pressures were showndiagrammatically. The paper was illustrated by
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