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In cases where the density of the air is not of average value, as on a high mountain, or with an exceptionally low barometer for example, an allowance must be made. Approximately 1-1/2% should be added to the velocity recorded by a tube anemometer for each 1000 ft. that it stands above sea-level.
He wanted a blow the harder the better and all eyes anxiously watched the anemometer, or wind gage. But ever it revolved lazily about in the gentle breeze. "Oh, for a hurricane!" cried Tom. He got his wish sooner than he anticipated.
It was a great thing to be independent of nautical observations, for as he approached the shores of India it might be difficult to take his bearings by his instruments, this being the season of the monsoon. When he left Constantinople his anemometer indicated a velocity of eighteen miles in the south-west wind, which, as he was steering south-east, was partly in his favour.
He wants to make a long flight, and I can't blame him," spoke Tom, in a low voice. "But if there's danger " "Oh, well, we can soon be at Cape May, and start back. The wind is freshening rather suddenly, though," and Tom looked at the anemometer, which showed a speed of twenty miles an hour. However, it was in their favor, aiding them to make faster time.
Unfortunately, the circumstances under which the spectacle was observed did not; admit of any resort to the barometer, thermometer, or anemometer. Should further observations verify these remarks, it might perhaps be proper to style this variety the Hemispherical. Dew is another atmospheric product.
The great advantage of the tube anemometer lies in the fact that the exposed part can be mounted on a high pole, and requires no oiling or attention for years; and the registering part can be placed in any convenient position, no matter how far from the external part. Two connecting tubes are required.
The speed of the wind could be read off on a dial below the arms. In addition there was an instrument called a Dines anemometer which supplied interesting tracings of the force, duration, and direction of the wind.
Lind's anemometer, which consists simply of a U tube containing liquid with one end bent into a horizontal direction to face the wind, is perhaps the original form from which the tube class of instrument has sprung.
Well, it's all right, anyhow it all helps." He looked at the spinning anemometer. It registered a speed of ninety-seven miles an hour. Yet now that they were out of sight of any land, only the rush of the wind and the enormous vibration of the plane conveyed an idea of motion.
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