Anemoscope; wind vane

Japanese: 風向計 - ふうこうけい（英語表記）anemoscope; wind vane

An instrument for measuring wind direction. Before 1950, it was called a wind fletching. There are instruments that use an arrow fletching to mechanically record its position, instruments that convert the change in the position of the arrow fletching into a change in electrical resistance and record it with a recording ammeter, and instruments that have contacts at equal intervals according to the wind direction angle and record the wind direction by opening and closing the contacts. There are two-bladed and one-bladed arrow fletchings that are attached vertically, and are designed so that the center of gravity of the whole is above the support. In Japan, wind direction was initially measured with a wind fletching and wind speed with a Robinson anemometer, or visually when no anemometer was available, but after the Meteorological Observation Act was enacted in 1886 (Meiji 19), wind direction was measured with a wind fletching and wind speed was measured with a Robinson anemometer.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

風向を測定する器械。1950年以前は風信器といった。矢羽根を使ってその位置を機械的に自記させるもの，矢羽根の位置の変化を電気抵抗の変化に変えて記録電流計で自記させるもの，風向角に従って等間隔に接点をつけておき，その接点の開閉によって風向を自記させるものなどがある。矢羽根には垂直に取り付けた 2枚羽根のものと 1枚羽根のものがあり，全体の重心が支柱の上になるようにつくってある。日本では当初，風向は風信器で，風速はロビンソン風速計で，風速計がない場合には目視で，それぞれ観測が行なわれていたが，気象観測法が制定された 1886（明治19）年から風向観測には風信器が，風速観測にはロビンソン風速計が，それぞれ使われるようになった。

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