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plural anemometers
(meteorology) An instrument for measuring and recording the speed of the wind, a windmeter. quotations
This anemometer was installed by the North Eastern Railway on Staithes Viaduct in 1884, to warn signallers of dangerously high winds.
2020 December 30, Tim Dunn, “The railway's mechanical marvels”, in Rail, page 57, photo caption