The London, Edinburgh and Dublin philosophical magazine and journal of science . peak potentials are corrected for theobserved damping and values obtained which, though inmuch better agreement than before with the observedvalues, are still considerably greater than the observedvalues. 9. Some further experiments in which the iron losses aregreatly reduced are described, but the same discrepancies asbefore are noted. 10. It is pointed out exactly in what points theory andexperiment agree and in what points they differ. It issuggested that it is still possible that the theory mayprovide a useful
The London, Edinburgh and Dublin philosophical magazine and journal of science . peak potentials are corrected for theobserved damping and values obtained which, though inmuch better agreement than before with the observedvalues, are still considerably greater than the observedvalues. 9. Some further experiments in which the iron losses aregreatly reduced are described, but the same discrepancies asbefore are noted. 10. It is pointed out exactly in what points theory andexperiment agree and in what points they differ. It issuggested that it is still possible that the theory mayprovide a useful guide to design of magnetos, and the con-siderations underlying the experiments to be described in asecond part of the paper are stated. XXY1. JSote on the Measurement of the Peak Potential of anAlternating Source. By Clifford C. Paterson, ,and Norman Campbell, * THE method of measuring the peak potential of an alter-nating source by means of a thermionic valve is nowfamiliar, but the conditions necessary for accuracy do notseem always to be appreciated. Fig-. A /v The connexions are shown in fig. 1. A is the source ofalternating potential, V the thermionic valve with its heating * Communicated by the Mag. S. 6. Vol. 37. No. 219. March 1919. Y 302 Mr. C. C. Paterson and Dr. N. Campbell on the battery well insulated from earth, E an electrostatic volt-meter, and C a condenser connected across the terminals ofthe voltmeter. A separate condenser C is not always in-serted ; if it is not, the capacity of C represents simply thecapacity of the voltmeter and its connexions. A is shownconnected to the valve so that the negative peak potential ismeasured ; if the positive peak potential is required, the leadsfrom the valve to A and E must be interchanged. The following are the conditions necessary for accuracy:— (1) The valve must pass no reverse current. (2) The insulation between the terminals of E must be sogreat that the potential between them does not
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