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A hemispherical-cup anemometer of the type invented in 1846 by John Thomas Romney Robinson. In meteorology, an anemometer (from Ancient Greek άνεμος (ánemos) 'wind' and μέτρον (métron) 'measure') is a device that measures wind speed and direction. It is a common instrument used in weather stations.
Faraday cup with an electron-suppressor plate in front. When a beam or packet of ions or electrons (e.g. from an electron beam) hits the metallic body of the cup, the apparatus gains a small net charge. The cup can then be discharged to measure a small current proportional to the charge carried by the impinging ions or electrons.
Cup-type anemometer on a remote meteorological station An occluded mesocyclone tornado (Oklahoma, May 1999) Wind direction is usually expressed in terms of the direction from which it originates. For example, a northerly wind blows from the north to the south. [8] Weather vanes pivot to indicate the direction of the wind. [9]
The station was upgraded in the 1960s and the number of instruments increased, including a bare soil minimum thermometer, a cup counter anemometer and a Casella siphon rainfall recorder. A new Meteorological Site came into operation on January 1, 1968, located on the main University campus between the University boiler house and Wilderness Wood.
A hemispherical cup anemometer of the type invented in 1846 by John Thomas Romney Robinson. John Thomas Romney Robinson (23 April 1792 – 28 February 1882), usually referred to as Thomas Romney Robinson, was an Irish astronomer. He was the longtime director of the Armagh Observatory, one of the chief astronomical observatories in the UK of its ...
Unlike traditional cup-and-vane anemometers, ultrasonic wind sensors have no moving parts and are therefore used to measure wind speed in applications that require maintenance-free performance, such as atop wind turbines. As the name suggests, ultrasonic wind sensors measure the wind speed using high-frequency sound.
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Anemometers. 1450 – Leone Battista Alberti developed a swinging-plate anemometer, and is known as the first anemometer. [22] – Nicolas Cryfts, (Nicolas of Cusa), described the first hair hygrometer to measure humidity. The design was drawn by Leonardo da Vinci, referencing Cryfts design in da Vinci's Codex Atlanticus. [22]