The watermark in the lower right corner of the image will not appear on the final print.
Frame
Top Mat
Bottom Mat
Dimensions
Image:
8.00" x 4.50"
Overall:
10.00" x 6.50"
Robinsons Anemometer, 1846 Poster
by Science Source
$53.00
Product Details
Robinsons Anemometer, 1846 poster by Science Source. Our posters are produced on acid-free papers using archival inks to guarantee that they last a lifetime without fading or loss of color. All posters include a 1" white border around the image to allow for future framing and matting, if desired.
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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Artist's Description
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.
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