| It consists of three conical cups mounted on a pillar with a double ball-bearing rotating shaft fitted on a beautiful powder coated box. HANDHELD. All three cups are in the same horizontal direction so that cups rotate freely in the air. The prevailing wind turns the cups and through a centrical shaft, the resulting force is transmitted. Three digits digital F.N.D. counter mounted in a box connected with the censor and On-Off and Reset switch. The unit operated by 9 volts D.C dry battery. Observe the digits in two minutes and divide by five answers is wind velocity in kilometre per hour. |
