. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. Fig. 4a.—Circuit of rock-resistivity tester, operated from light socket (after M. W. Pullen). Bridge Wire. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Society of Exploration Geophysicists. Tulsa

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Keywords: ., bo, bookcentury1900, booksubjectpetroleum, booksubjectprospecting