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| image title | Wet and dry bulb thermometers |
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| caption | Inside the Radcliffe Observatory's Stevenson screen are four thermometers. The (vertical) 'dry bulb' thermometer is a mercury-in-glass instrument that measures the still air temperature. The (vertical) 'wet bulb' thermometer is a mercury-in-glass instrument that has a fabric sleeve surrounding the bulb, connected by a wick to a reservoir of distilled water. The temperature recorded by this thermometer is lowered by evaporation from the wick. Look-up tables of dry-bulb (air) temperature and the difference between the wet and dry bulb temperatures can be used to deduce the relative humidity. |
| code | MI006 |
| Section | Meteorological instruments |
| Subsection | Surface-based instruments |
| image credit | © The Open University |
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