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in a locally widened portion of the capillary serves as a trap to prevent further addition of mercury if the thermometer is warmed and the mercury expands past the break-off point. The remote-reading potentialities of reversing thermometers make them particularly suitable for use in measuring subsea temperature as a function of pressure. In this application, both protected thermometers and unprotected thermometers are used, each of which is provided with an auxiliary thermometer. They are generally used in pairs in
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It consists of a conventional bulb connected to a capillary in which a constriction is placed so that upon reversal the mercury column breaks off in a reproducible manner. The mercury runs down into a smaller bulb at the other end of the capillary, which is graduated to read temperature. A 360° turn
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for later viewing. When inverted, these thermometers capture and display the current temperature until they are returned to their upright position. From around 1900 to 1970, reversing thermometers were the primary instruments
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which, unlike most conventional mercury thermometers, has the unique ability to record a
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Gille, Sarah T. (2002). "Warming of the
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