According to 151 Specification No. IS 5912-70. The instrument has a glass wheel comprising of three tapered mugs in a level plane. The glass wheel shaft Is of stainless steel and associated by worm outfitting to an unrest counter mounted in a water evidence lodging. By watching the counter perusing toward the start and end 01 a time of intrigue the normal breeze speed amid the Interval can be calucl:1lated. The C0unter watching window is inclined to allow simple perusing when mounted on the pole.

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