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The most straightforward way to measure temperature versus
depth in the ocean is to lower a thermometer a known distance and
take the temperature. So-called 'protected reversing thermometers'
have been developed for just that purpose, and are routinely
accurate to 0.02 degrees C. One disadvantage of this method is
that temperatures can only obtained for a few depths.
The great advantage of the 'bathythermograph' is that,
although less accurate than the reversing thermometer, it gives a
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