Abstract
Two types of wind shield for rain gauge, i. e., conical and hollow ring-shaped designs are tested in combination with in tegral and separated equipment housings, both in water tank and in wind tunnel. The flow patterns are photographed by mea ns of aluminium powder spread over the water surface of the tank, or wool strings tied to the model in the wind tunnel. By the inspection of the photographs taken in two-dimensional aspect in water tank, together with those taken in three-dimensional aspect in wind tunnel, the conical wind shield wi th a flat circular edge combined with separated housing is found to be th e most satisfactory, giving uniform horizontal flow and generating the minimum of eddies around the rain gauge funnel mouth.
