風向標

風向標是測定風的來向的儀器。一般安裝在四周空曠、離地約10米高的杆子上。在風壓作用下，風標箭頭指風的來向。一般會分作頭部、水平桿和尾翼三個部分。風向標最早的書面記載出現在中國西漢時期的《淮南子》，時稱侯風扇^[1]。公元前50年古雅典建設的風之塔頂則安裝了風向標保留至今^[2]。歐洲一些雞型的風向標又稱作風信雞。

參考

西方屋頂常見的雞型風向標（風信雞）
風向計

參考資料

[1]
Needham, Joseph; Ling, Wang, Science and Civilisation in China: Mathematics and the Sciences of the Heavens and the Earth 3, Cambridge University Press: 478, 1959
[2]
Noble, Joseph V.; Price, Derek J. de Solla. The Water Clock in the Tower of the Winds. American Journal of Archaeology. October 1968, 72 (4): 345–355 (353). JSTOR 503828. doi:10.2307/503828.

[Needham-1] [1]
Needham, Joseph; Ling, Wang, Science and Civilisation in China: Mathematics and the Sciences of the Heavens and the Earth 3, Cambridge University Press: 478, 1959

[2] [2]
Noble, Joseph V.; Price, Derek J. de Solla. The Water Clock in the Tower of the Winds. American Journal of Archaeology. October 1968, 72 (4): 345–355 (353). JSTOR 503828. doi:10.2307/503828.

[1]

[2]