Sonar surveying (Boston, MA) - 1962

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Description: (curated)

Two sonargraphs, labeled (bottom) "Boston Harbor July 4 1962, H. Edgerton, J. Pogue, Range 80', 0.25 MFD x100 Alden 80" and (top) "Charles River, July 4 1962, H. Edgerton, J.Pogue, Scale 80 ft, 05 MFD DAMPED, x100, Alden 4". (CC)

HEE-SC-00475

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