Plate 4:
Resistivity surveying with the Nash and Thompson Geophysical Tellohm Soil Resistance Meter and probe selection box, showing reel frame (1/25 sec, f11).
John Wilcock in check shirt.
Oxford University Cave ClubCave Research Group publication 141961 Oxford University Expedition to Northern Spain |
1961 Expedition Report (CRG 14) Figures |
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Plate 4: Resistivity surveying with the Nash and Thompson Geophysical Tellohm Soil Resistance Meter and probe selection box, showing reel frame (1/25 sec, f11). John Wilcock in check shirt. |