windmill anemometer

windmill anemometer

[′win‚mil ‚an·ə′mäm·əd·ər]
(engineering)
A rotation anemometer in which the axis of rotation is horizontal; the instrument has either flat vanes (as in the air meter) or helicoidal vanes (as in the propeller anemometer); the relation between wind speed and angular rotation is almost linear.
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