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by Science Source
$33.00
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Purchase a tote bag featuring the photograph "Robinsons Anemometer, 1846" by Science Source. Our tote bags are made from soft, durable, poly-poplin fabric and include a 1" black strap for easy carrying on your shoulder. All seams are double-stitched for added durability. Each tote bag is machine-washable in cold water and is printed on both sides using the same image.
Design Details
An anemometer is a device for measuring wind speed, and is a common weather station instrument. A simple type of anemometer, invented (1846) by Dr.... more
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An anemometer is a device for measuring wind speed, and is a common weather station instrument. A simple type of anemometer, invented (1846) by Dr. John Thomas Romney Robinson, of Armagh Observatory. It consisted of four hemispherical cups each mounted on one end of four horizontal arms, which in turn were mounted at equal angles to each other on a vertical shaft. The air flow past the cups in any horizontal direction turned the cups in a manner that was proportional to the wind speed. Therefore, counting the turns of the cups over a set time period produced the average wind speed for a wide range of speeds. On an anemometer with four cups it is easy to see that since the cups are arranged symmetrically on the end of the arms, the wind always has the hollow of one cup presented to it and is blowing on the back of the cup on the opposite end of the cross.
$33.00
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