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The Campbell-Stokes Pattern Sunshine Recorder is used to measure the duration of sunshine, (that is, the number of hours of sunshine per day). This is a tropical pattern suitable for use in the latitudes 5 Degrees South to 45 Degrees North. Bowl made of Tin Bronze surface finished black painted and hard Lacquer, with cut glass sphere mounted concentrically in a section of the spherical bowl, the diameter of which is such that when the instrument is exposed to sun rays they are sharply focused on a card held in the grooves of the bowl, the focused sunray's burn a trace on the recording card which has a time scale printed on it. The length of the burn indicates the period of bright Sunshine during the day. Complete in a wooden box with the recording cards for one year.
The purpose of the Stevenson Screen is to create
a uniform temperature enclosure that closely represent 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.
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