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Wind Speed from a Cup Anemometer: Robinson's One-Third Law (1850)
The cups of a cup anemometer move at one third of the wind's speed. Count the turns in a minute and the notebook turns them into miles per hour and metres per second.
Result: the wind speed, from Robinson's portable instrument (cups on a 5.6 in radius: turns per minute / 10 = mph).
Source: T. R. Robinson, Transactions of the Royal Irish Academy vol. 22 (1850), pp. 158, 168-169. Photo: NOAA, public domain.
初学者
30 minutes
说明
1
1
Set up in the wind
Set up in the wind
Stand the cup anemometer in the open wind. Robinson's portable one: four hemispherical cups 3.1 in across, centres on a 5.6 in radius, turning a counter (an endless screw driving two wheels of n and n+1 teeth). Four cups worked better than five or three.
所需工具：
风杯式风速仪
大气空气 - 地球2
2
Count one minute
Count one minute
Count the revolutions in one minute, from the counter or by watching one cup. Ours: a stopwatch.
所需工具：
风杯式风速仪
机械秒表3
3
Work out the wind speed
Work out the wind speed
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所需工具：
风杯式风速仪机械秒表CC0 公共领域
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