Word: pinger
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Dates: during 1960-1969
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...company has grown, its business approach has remained scientifically nonchalant. Chairman Edgerton continues to hold business conferences at lunch in the M.I.T. cafeteria, and avoids board meetings whenever he can. Weekends, he uses his own underwater sonic pinger for a scientist's hobby: probing Boston's Charles River for an 800-year-old Viking ship that he believes may lie on the bottom...
Trick Dredge. The problem was solved by Woods Hole's Andrew Nalwalk, who designed a special dredge that would flip itself free if it got snagged on a boulder. Three hundred feet up its cable it carried a "pinger," whose sound could be detected by the Chain four miles above. The interval between the pinger's sound and its reflection from the bottom told the scientists when the dredge was on the bottom and moving with its cable at a proper angle. This eliminated "kiting" (sailing above the bottom) and snarl-ups caused by letting out too much...