Unprotected thermometer
From Glossary of Meteorology
unprotected thermometer
A reversing thermometer (for seawater temperature) that is not protected against hydrostatic pressure.
The mercury bulb is therefore squeezed, and the amount of mercury broken off on reversal is a function both of temperature and of hydrostatic pressure. When compared with the simultaneous reading of a protected thermometer, which is affected by temperature only, the unprotected thermometer reading can be converted to pressure, and then, by applying the mean density of the water, to depth.
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