Velocity anemometers may again be subdivided into two classes, (1) those which do not require a wind vane or weathercock, (2) those which do. [Please select]
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There were a number of earlier self-registering anemometers, but no evidence of their extended use. [Please select]
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Laughton, "Historical Sketch of Anemometry and Anemometers," _Quarterly Journal of the Royal Meteorological Society_, 1882, vol. [Please select]
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