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Sydney "Bud" Knott examining echsounder data.

Sydney "Bud" Knott examining echsounder data.
Sydney "Bud" Knott examining echsounder data.
Sydney "Bud" Knott examining echsounder data.
Sydney "Bud" Knott examining echsounder data.
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Sydney "Bud" Knott examining echsounder data.
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04/01/1962
com/cullen/Knott_PGR.jpg
Principal developer, with Warren Witzell, of the precision graphic recorder, a modern echosounder. Knott received the Navy's Meritorious Public Service Citation for his work during the search for the Thresher.
Image of The Day caption:
Research specialist and hydro-acoustics engineer Sydney "Bud" Knott (above) is considered the father of modern echo-sounding. In the 1950s, he was the principal developer, with Warren Witzell, of the precision graphic recorder (PGR), one of the first modern echosounders. In April 1964, Knott and others at the Institution responded to a call from the U.S. Navy for help searching for the submarine Thresher, which had been lost at sea in waters near Cape Cod. As a result of his help using a PGR in the search, Knott received the U.S. Navy's Meritorious Public Service Citation, one of the highest honors the Navy grants a civilian.
Photo courtesy of WHOI Archives
© Woods Hole Oceanographic Institution
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