reversing thermometer

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Noun1.reversing thermometer - a thermometer that registers the temperature in deep waters
thermometer - measuring instrument for measuring temperature
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This is a slow increase in temperature over time with a trend that is apparent in records that date to the early 1920s when deep-water oceanographic measurements were first made near Bermuda with accurate reversing thermometers. The long-term trend of this temperature change is at a rate of approximately 0.5 [degrees] C per century.