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An otter board Front of the otter board Folded otter board. The otter is a fishing device constructed with two parts, an otter board and a fishing line. It is steered by pulling on the line then letting stack so the slide mechanism on the board operates to switch direction. It may be used from a boat or pulled from the shore.
Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...
A sailor and a man on shore, both sounding the depth with a line. Depth sounding, often simply called sounding, is measuring the depth of a body of water.Data taken from soundings are used in bathymetry to make maps of the floor of a body of water, such as the seabed topography.
A modern fishfinder displays measurements of reflected sound on a graphical display, allowing an operator to interpret information to locate schools of fish, underwater debris and snags, and the bottom of a body of water. Fishfinder instruments are used both by recreational and commercial fishermen, as well as by marine biologists.
Various types of FADs have been employed in the traditional fishing cultures of Island Southeast Asia (especially in the Philippines), Japan, and Malta for centuries. Modern FADs are increasingly being used in modern commercial and sport fishing. [1] Echo sounder buoy example model 1 An example echo sounder buoy printed circuit board.
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On 1 September 1876, he was granted a patent for his "deep-sea sounding by piano-forte wire" device. [6] Thomson invested in the Glasgow company White & Barr, already a supplier of scientific apparatus made to his designs, to manufacture and market the machine. Thomson became a director of the company, renamed Kelvin & James White Ltd., in 1900.