The significance and accuracy of measurements of Earth‐current potentials

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Abstract
The superficial simplicity of measurements of earth‐current potentials makes them liable to error due to inadequate appreciation of the requirements for securing satisfactory records and has led to faulty interpretation of the results obtained. Records from the multiple systems at Watheroo and Huancayo demonstrate the lack of significance of the absolute values of potential recorded and of the long‐period changes in them, most of which are due to meteorological conditions. The value of independent records as a check on the satisfactory operation of the recording equipment and as an indication of anomalous results due to local structural inhomogeneity is shown by examples taken from the records from these two observatories. Duplicate potential records and earth‐resistivity data both are essential for adequate study of the phenomenon.

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