The unit is composed of a probe; a wire link; and a shipboard canister. Inside of the probe is a thermistor which is connected electronically to a chart recorder. The probe falls freely at 20 feet per second and that determines its depth and provides a temperature-depth trace on the recorder. A pair of fine copper wires which pay out from both a s...
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http://en.wikipedia.org/wiki/Bathythermograph
instrument for recording water temperature as compared to depth
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http://phrontistery.info/b.html
any of various oceanographic devices containing temperature- and pressure-sensitive elements and producing a continuous record of underwater ... [1 related articles]
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http://www.britannica.com/eb/a-z/b/31
bathythermograph, bathythermography An instrument that automatically records the temperature of water at various depths.
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http://www.wordinfo.info/words/index/info/view_unit/2724/8
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