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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.
Olùbẹ̀rẹ̀
30 minutes
Ìlànà
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.
Àwọn irinṣẹ́ tí a nílò:
Anemometer oníkọ́ọ̀pù
Afẹ́fẹ́ àyíká ayé - Ayé2
2
Count one minute
Count one minute
Count the revolutions in one minute, from the counter or by watching one cup. Ours: a stopwatch.
Àwọn irinṣẹ́ tí a nílò:
Anemometer oníkọ́ọ̀pù
Aago Ìwọ̀n Àkókò Ẹlẹ́rọ3
3
Work out the wind speed
Work out the wind speed
Ń ṣí ìwé Jupyter…
Àwọn irinṣẹ́ tí a nílò:
Anemometer oníkọ́ọ̀pùAago Ìwọ̀n Àkókò Ẹlẹ́rọÀwọn irinṣẹ́ tó nílò
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