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Instruments kept in Stevenson's Screen...
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Transcript
Here is a quick look of the instruments.
Who invented it??
Thomas Stevenson
Recommended that the screen be placed at least twice the distance of the height of the object, e.g., 20 m from any tree that is 10 m high, or 40 ft from one 20 ft high. In the northern hemisphere, the door of the screen should always face north so as to prevent direct sunlight on the thermometers. In polar regions with twenty-four hour sunlight the observer must take care to shield the thermometers from the sun and at the same time avoiding a rise in temperature being caused by the observer's body heat.
Last but not least, Here a short video clip of how Stevenson Screen works...
Thank You!
ZiYuan( 23 )
The siting of the screen is very important to avoid data degradation by the effects of ground cover, buildings and trees
A special type of Stevenson screen with an eye bolt on the roof is used on a ship. The unit is hung from above and remains vertical despite the movement of the vessel.
The interior size of the screen will depend on the number of instruments that are to be used. A single screen may measure 765 mm high by 610 mm wide by 593 mm deep (30.1 in by 24.0 in by 23.3 in) and a double screen 765 mm high by 1050 mm wide x 593 mm deep (30.1 in by 41.3 in by 23.3 in). The unit is either supported by four metal or wooden legs or a wooden post
It was designed by Thomas Stevenson (1818-1887), a British civil engineer and father of the author Robert Louis Stevenson.
The top of the screen was originally composed of two asbestos boards with an air space between them. These asbestos boards have generally been replaced by a laminate due to health and safety reasons. The whole screen is painted with several coats of white to reflect sunlight radiation and will usually require repainting every two years.
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The Stevenson screen holds instruments that may include thermometers (ordinary, maximum/minimum), a hygrometer, a psychrometer, a dewcell, a barometer and a thermograph.
- A Stevenson screen or instrument shelter is an enclosure to shield meteorological instruments against precipitation and direct heat radiation from outside sources, while still allowing air to circulate freely around them.[1] It forms part of a standard weather station
Most suitable location for Stevenson's Screen : Open field
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