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| 单词 | wheel barometer |
| 释义 | > as lemmaswheel barometer The common barometer is a straight glass tube, 34 inches long and closed at the top, filled with mercury, and inverted in an open cup of the same liquid. The siphon barometer is a curved tube, with the mercury in the shorter limb exposed to the air; it is adapted as the wheel barometer found in ordinary weather-glasses by putting on the mercury in the shorter limb a float with a cord attached, which passes over a pulley, and as the float rises or falls, moves the indicating hand. For very exact readings a lofty tube filled with glycerine is sometimes used. See also aneroid adj. and n.extracted from barometern.< as lemmas |
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