The Stevenson screen is a rectangular wooden box provided with a door in front. All the four sides are double louvered, the roof is double and the floor consists of overlapping boards separated by an air space. The front door is hinged at the bottom and provided with two brass chains so that it comes to rest in an approximately horizontal position when opened to its full extent. The Stevenson screen itself is supported on four legs. A wooden frame on which the thermometers are mounted is firmly fixed in position inside the screen.
(This frame is optional in the case of large screen) available in two sizes.