The ‘Virtual’ make Stevenson Screen, manufactured as per IS: 5948:1970, are standard shelter (from rain, snow
and high winds, but also leaves and animals) for meteorological instruments, particularly Max., Min., wet and dry
bulb thermometers used to record humidity and air temperature.
It is kept 1.2m above the ground by legs / Concrete Pillars to avoid strong temperature gradients at ground level, has louvred sides to encourage the free passage of air, and is painted white to reflect heat radiation, since what is measured is the temperature of the air in the shade, not of the sunshine.
Walls and floor of white-painted wood provide screening, and extensive louvres maintain adequate ventilation on all
but the stillest days.
