Abstract
LONDON.
Physical Society, June 12.—Captain Abney, K.R.S., President, in the chair.—Mr. Campbell read a paper on the measurement of very large and of very small alternating currents. The author advocates the use of air-coil transformers for measuring voltages and currents which are either above or below the range of the instruments available. If an attempt is made to measure the current in the primary of an air-coil transformer by observing the voltage on an open circuit secondary, it is found that the readings depend on the frequency. In order to overcome this difficulty the author uses a closed secondary with a very high inductance. In this case the primary current is proportional to the secondary current, which latter may be measured by an ammeter.
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Societies and Academies. Nature 54, 165–168 (1896). https://doi.org/10.1038/054165a0
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DOI: https://doi.org/10.1038/054165a0