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An electronic current meter goes over the side of Crawford in 1965.

An electronic current meter goes over the side of Crawford in 1965.
An electronic current meter goes over the side of Crawford in 1965.
An electronic current meter goes over the side of Crawford in 1965.
An electronic current meter goes over the side of Crawford in 1965.
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An electronic current meter goes over the side of Crawford in 1965.
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01/01/1965
com/cullen/65 Curr Mtr.jpg
Gus Day (bottom) and Marvel Stalcup (glasses). Launched from the Crawford. Sensor at bottom of the electronic current meter is used to determine curent speed. Sensor at top of the cylinder determines direction. Data recorded from these two sensors is recorded electronically within the center cylinder on photographic film. Meters are later retrieved to obtain recorded data. Date is approximate.
Image of The Day caption:
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.
Image Of the Day repeat caption:
Marvel Stalcup (with glasses) and Gus Day launch an early instrument to determine current speeds and directions from the research vessel Crawford circa 1965. Data were recorded on photographic film. Modern oceanographers use Acoustic Doppler Current Profilers (ADCPs). They transmit sound waves that ricochet off particles suspended in moving water and reflect back to the instrument. Due to the Doppler effect, sound waves bounced back from a particle moving away from the ACDP have a lower frequency when they return. Particles moving toward the instrument send back higher frequency waves. The instrument uses this Doppler shift to calculate how fast the particle and the water around it are moving.
Caption from Down to the Sea for Science, pg. 47:
An electronic current meter goes over the side of Crawford in 1965. Development of modern, long-lived current meters was vital to progress in Gulf Stream research.
Photo courtesy of Woods Hole Oceanographic Institution Archives
© Woods Hole Oceanographic Institution
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