风会促使冷热空气进行交换,是引起天气变化的重要因素之一。为了正确预测天气,人们发明了各种风信器来观测风向。据史书记载,我国东汉时期著名的科学家张衡发明了一种精巧的风信器——相风铜鸟.在一根5丈(约16米)高的直杆上放置一只衔着花的铜鸟,它可以随风转动,鸟头所指的就是风的方向。这也是世界上最早的测量风向和风速的仪器,它要比12世纪欧洲的候风鸡早了1000年。现在,我们也来制作一个简易的风信器,它不但能正确指示风向,而且双翼还能随风转动,十分有趣哦! The wind will promote the exchange of hot and cold air is one of the important factors that cause the weather changes. In order to correctly predict the weather, people invented a variety of wind instruments to observe the wind direction. According to historical records, Zhang Heng, a famous scientist in the Eastern Han Dynasty, invented a clever messenger - a bronze bird, on which was placed a flower of copper Bird, it can rotate with the wind, the direction of the bird's head is the wind. It is also the earliest instrument in the world to measure wind direction and wind speed, which is 1000 years ahead of the European chicken in the 12th century. Now, we also come to make a simple hyacinth, it not only can correctly indicate the direction of the wind, but also the wings can rotate with the wind, very interesting oh!