Measuring the depth of the ocean

Measuring the depth of the ocean

V565/0028 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 10.1MB

Downloadable file size: 493.6KB

Price image Pricing

Please login to use the price calculator


Restrictions: This image may not be used to state or imply NOAA endorsement of any company or product

Caption: Measuring the depth of the ocean. Reginald Fessender (1866-1932) using his invention, the electric oscillator, on a boat. This acoustic device, now known as a fathometer, was used to measure the depth of the ocean by emitting a sound and detecting its echo from the sea bed. The length of time before the echo is returned to the detectors at the sea surface indicates how deep the water is. The fathometer, which was invented in 1915, was intended for underwater signalling, communication, and obstruction avoidance device. For this pioneering invention, Fessender won the Gold Medal prize from the journal Scientific American in 1929. Photographed on 11th September 1915.

Release details: Model release not available. Property release not required.

Keywords: 11 september, 11th september, 1900s, 1910s, 1915, 20th century, 40s, 49, 50s, adult, black-and-white, boat, canada, caucasian, engineer, engineering, equipment, fathometer, fessenden oscillator, forties, gold medal, historical, history, history of science, human, inventor, machine, male, man, mathematical, mathematics, measurement, measuring, middle-aged, monochrome, ocean, oscillator, people, person, physical, physics, reginald fessenden, scientific american, sea, ship, sonar, sonar device, sound waves, technological, technology, underwater signalling, white

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.