The purpose of the Stevenson Screen is to create, as near as possible, uniform-temperature enclosure at the same temperature as the air outside.
The screen is designed to shield thermometers from precipitation and direct radiation from the sun, while allowing air to circulate freely round them. It houses maximum and minimum thermometers and a wet-and-dry-bulb hygrometer. It is made from wood with louvered sides to allow the free and even flow of air. The front panel is hinged at the bottom to form a door, which allows for maintenance and the reading of the thermometers. The whole screen is painted white to reflect radiation