= Cup anemometer
A <cup anemometer> infers wind speed from the rotation rate of cups mounted around a vertical axis. The cup <geometry> produces different aerodynamic <forces> on the two sides of the rotor, giving a net driving torque.
A <calibration> relates rotation <frequency> to flow speed over the useful range. Bearing friction affects low speeds, and rotor inertia <limits> response to rapid fluctuations. The cup speed is not simply equal to wind speed. Comparing the output with a reference flow establishes the transfer relation needed for quantitative <observations>.
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