| The standard housing for meteorological thermometers designed by Thomas
Stevenson, civil engineer (father of Robert Louis Stevenson).
It consists of a wooden cupboard, with hinged door, mounted on a
steel or timber stand, so that its base is about 3 ft 6 in. above the ground,
the whole painted white. Indirect ventilation is provided through the
bottom, double roof and louvered sides, and instruments placed within it
give a close approximation to the true air conditions, undisturbed by the
effects of direct solar or terrestrial radiation. |
