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"I'm afraid not," answered Tom, as he noted the anemometer and felt the shudderings of the WHIZZER as she careened on through the gale. "It hasn't blown out yet!" The pale light increased. The electrics seemed to dim and fade. Tom looked to the engines. Some of the apparatus was in need of oil, and he supplied it. When he came back to the main cabin, where stood Mr. Damon and Mr.
The meteorologist had got his recording station, containing anemometer, barograph, and thermograph, rigged over the stern. The geologist was making the best of what to him was an unhappy situation; but was not altogether without material.
Comparison with Framheim, Amundsen's observation station, shows that we at Cape Evans had ten times as much high wind as the Norwegians experienced. Our wind velocities reached greater speeds than 60 miles an hour, whereas there does not appear to be any record of wind higher than 45 miles an hour at Amundsen's base at the Bay of Whales. Some of our anemometer records were very interesting.
It came pattering down upon the roof; and under the strong impulse of wind and their speed, it struck the glass windows in front with a smack like buckshot. The moisture on the panes made it difficult to see out. "Take a reading with the anemometer, Tom," ordered John, straining his eyes hard ahead. This little instrument was something like a miniature windmill.
Among these are an anemometer slowly revolving in the light air, maximum and minimum bulbs in the shade, on the ground and beneath it, a most ingenious sun dial, and a heliometer. Walking inland along the central avenue, we pass some native shops, one of which bears the interesting name of Williams Brothers.
Instruments of this kind have been in use for a long series of years, and have recorded pressures up to and even exceeding 60 lb per sq. ft., but it is now fairly certain that these high values are erroneous, and due, not to the wind, but to faulty design of the anemometer.
Doubling forty is eighty miles an hour, and again multiplying 8 by 4, we have 32 as the pounds pressure at a speed of 80 miles an hour. The anemometer, however, is constant in its speed. If the pointer should turn once a second at 10 miles an hour, it would turn twice at 20 miles an hour, and four times a second at 40 miles an hour.
It is, however, constructed in a style very different from those somewhat forbidding abodes. At the top is an observatory tower, placed on a platform, and upon this is placed the anemometer, especially constructed to withstand the force of the storms.
THE ANEMOMETER. It requires an expert to judge the force or the speed of a wind, and even they will go astray in their calculations. It is an easy matter to make a little apparatus which will accurately indicate the speed. A device of this kind is called an Anemometer.
Velocity anemometers may again be subdivided into two classes, those which do not require a wind vane or weathercock, those which do. The Robinson anemometer, invented by Dr. Thomas Romney Robinson, of Armagh Observatory, is the best-known and most generally used instrument, and belongs to the first of these.
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