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Anemometer
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====Three cup==== The three-cup anemometer developed by Canadian John Patterson in 1926, and subsequent cup improvements by Brevoort & Joiner of the United States in 1935, led to a cupwheel design with a nearly linear response and an error of less than 3% up to {{convert|60|mi/h|km/h|abbr=on}}. Patterson found that each cup produced maximum torque when it was at 45Β° to the wind flow. The three-cup anemometer also had a more constant torque and responded more quickly to gusts than the four-cup anemometer.
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