(3)No part of the wet bulb shall be within [75 mms.] [Substituted by No.1, dated 24.3.1979.] from the dry bulb or less than [25 mms.] [Substituted by No. 1. dated 24.3.1979.] from the surface of the water in the reservoir and the water reservoir shall be blow it, on the side of it away from the dry bulb.
