. Investigation of the aluminum cell : the rectifier. ufficient-ly high voltage to cause an en-ergy loss great enough to be readwith ordinary instruments. A plug switch was usedto throw one wattmeter on any oneof the cells, so that any errorin the instrument would be thesame for all three cells, thusmaking the ratio of the lossesvery nearly of Atmospheric Pressure. The effect of atmospheric pressure on the film wasstudied by a simple apparatus, a photograph of which is repro-duced in Fig. 9. The general wiring diagram is the same asthat for the first test mentioned in this chapt
. Investigation of the aluminum cell : the rectifier. ufficient-ly high voltage to cause an en-ergy loss great enough to be readwith ordinary instruments. A plug switch was usedto throw one wattmeter on any oneof the cells, so that any errorin the instrument would be thesame for all three cells, thusmaking the ratio of the lossesvery nearly of Atmospheric Pressure. The effect of atmospheric pressure on the film wasstudied by a simple apparatus, a photograph of which is repro-duced in Fig. 9. The general wiring diagram is the same asthat for the first test mentioned in this chapter. The re-sults checked quite well with those published by Dr. A. ?. Car-man in the Physical Review. On account of the great varia-tion due to the use of different electrolytes, no importantdata was preserved from this test, except a sufficient amountto show that a change of two or three atmospheres above at-mospheric pressure did not produce an important change in thevalve action, so far as rectification was concerned. Fig. 8. Separation of Losses. * Fig. 9. Pressure Apparatus. \ Tests of Rectifying Sets, The effect of atmos-j pherie pressure on the film unit was, however, only a sub-division of the study of rec-tifier sets. Several types ofaluminium rectifiers were test-ed, and in all cases the inputand output were measured in themanner described above. In thesingle phase types at overload,the total current in the rectified circuit greatly exceededthat measured by the ammeter, on account of the large,leakage current. The amount of this total current was found hyplacing an AC-DC ammeter in series with the other. From thetwo readings of current, the leakage- and capacity-current wasthen found, and the result checked hy the oscillograph. A de-tailed explanation of this simple method will be found in thethesis for 1912, on Investigation of Aluminium Tests, For comparing the films formed by various electrolytes,direct current was used. Two generators in serie
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