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.
An anemometer measures wind speed. It also can be attached by electric wires that transmit the varying speeds, wind speed changeds during the day with wind gusts, and recorded on a cylinder with graph paper showing the numbers or values of that wind speed. a windometer, a large tubular device 20 ft long and one foot high.