The main contention of Mr. Weaver that mathematical and physical analysis of the problems involved should precede and accompany the field application of any geophysical method of prospecting rather than a purely empirical or trial-and-error approach is eminently sound, in my opinion. We may imagine where the electrical industry would be today if it had been forced to rely on trial-and-error methods of development rather than on the analysis of Kelvin, Maxwell, Heaviside, Steinmetz and their successors.

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