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Gus Day (bottom) and Marvel Stalcup (glasses) working on the R/V Crawford.

Keeping Current

Marvel Stalcup (foreground, with glasses) and Gus Day launch instruments from the research vessel Crawford in the 1960s. The sensor at bottom was an early electronic current meter, used to determine curent speed. The sensor at top of the cylinder captured current direction. Data was recorded within the center cylinder on photographic film. (Photo courtesy of Woods Hole Oceanographic Institution archives)

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