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His measurement of 1,996 feet was updated in 1959 based on acoustic echo sounding.
From National Geographic
In the third boat was an oceanographer of the University of Miami's marine laboratories.The oceanographer would trace Root's descent with echo sounding gear, just to make the record official.
From Time Magazine Archive
When Woods Hole scientists took a closer look at the Trench, they found by echo sounding that its north wall is scored by fractures where deep-down rock seemed to be freshly exposed.
From Time Magazine Archive
Only an echo, sounding hollowly from below, replied to break the vast silence. t was puzzling—inconceivable.
From Astounding Stories of Super-Science, June, 1930 by Harry Bates
What was this echo sounding in her ears?
From The Price of Things by Elinor Glyn
