Consists of a thin square aluminum vane centrally suspended from a horizontal wire mounted in a vertical frame. The velocity of the air current is obtained from the measurement of the torque that has to be applied to the wire to bring the vane back to its vertical position. The instrument is mounted on a tripod, and the arrangement is such that the torsion can be applied, at a point 2 ft (0.6 m) away from the vane, by means of a shaft and bevel gearing. The instrument has been used to measure low air velocities in mines down to about 10 ft/min (3 m/min) and up to 180 ft/min (55 m/min). Syn: torsion anemometer
Source: Dictionary of Mining, Mineral, and Related Terms












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