How Much Do Diamond Engagement Rings Cost. There are two major factors which contribute to the cost of a diamond: a ratings system called the âFour Csâ and whether or not the diamond is ASG/GIA certified. The Four Cs refers to the diamondâs color, cut, clarity, and carat size.
Best Answer: A wind vane is used to tell wind direction. The National Weather Service and those that have a lot of money use a Aerovane. Aerovanes are commonly used at many weather stations and airports to measure both wind direction and speed.
To measure wind speed and direction, a meteorologist uses an anemometer. One type of anemometer is a horizontal windmill; it has small plastic cups affixed to metal arms on a pivot that spins in response to the wind. A separate vane indicates the wind direction.