Definition of fathometer
An instrument used in measuring the depth of water by the time required for a sound wave to travel from surface to bottom and for its echo to be returned. It may also be used for measuring the rise and fall of the tides in offshore localities.
What is the use of Fathometer?
Echo sounding is effectively a special purpose application of sonar used to locate the bottom. Since a traditional press unit of water depth was the fathom, an instrument used for determining water depth is sometimes called a fathometer.
How does a Fathometer work?
Fathometer. Fathometer, underwater device used on ships to measure the depth of water. As the speed of sound in water is known, the fathometer works by sending a sound down through the water, to be returned by echo.
When was the Fathometer invented?
Herbert Grove Dorsey (April 24, 1876 – 1961) was an American engineer, inventor and physicist. He was principal engineer of the United States Coast and Geodetic Survey Radio sonic Laboratory in the 1930s. He invented the first practical fathometer, a water depth measuring instrument for ships.
How is the depth of sea measured by using sound?
The depth of the ocean is calculated by knowing how fast sound travels in the water (approximately 1,500 meters per second). This method of seafloor mapping is called echo sounding. … Water depth is typically measured by echo sounders that transmit sound at 12 kilohertz (kHz).
What do you use to measure the depth of the ocean?
Depth finder, also called echo sounder, device used on ships to determine the depth of water by measuring the time it takes a sound (sonic pulse) produced just below the water surface to return, or echo, from the bottom of the body of water. … sonar devices are used to measure the depth of sea.
What is Aqua meter?
The AQUA METER is a compact Sensor/Converter device of electromagnetic measure designed to complete an installation of Inline lift pumping DIP system and measure the instant flow and pumped volume.
What is the deepest ocean?
The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam. Challenger Deep is approximately 36,200 feet deep.
How deep is a phantom?
A fathom is a unit of length in the imperial and the U.S. customary systems equal to 6 feet (1.8288 m), used especially for measuring the depth of water. There are two yards (6 feet) in an imperial fathom.
Why is it called a fathom?
The longest of many units derived from an anatomical measurement, the fathom originated as the distance from the middle fingertip of one hand to the middle fingertip of the other hand of a large man holding his arms fully extended. The name comes from the Old English faedm or factum, meaning outstretched arms.