Wind Vane Wind Direction, For Metereological

It meets three important requirements for accurate indication of wind direction. It is designed to produce the maximum of torque relative to its moment of  generator for a given change in wind direction. It rotates with minimum friction, and is balanced to avoid bias  towards any particular direction. Most suitable for  mounting on buildings very useful Meteorological  departments. As per I.S.I. specification with cardinal  points on cast iron stand.