Geophysicists perform an electrical resistivity survey with a ratiometer in the Reefton area in 1937. This was part of a search for gold-bearing quartz reefs. From left: W. E. Hall, R. L. McHenry, and F. A. McNeill. This is possibly the earliest photograph of geophysical field work in New Zealand.
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Private collection, Maxwell Gage
Photograph by Maxwell Gage
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