An "'aneroid barometer "'is an instrument for measuring pressure as a method that does not involve liquid.
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As the pressure increases, the aneroid is pushed down causing the arm to move up and leave a trace on the paper.
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The needle valve is controlled by an aneroid bellows that senses barometric pressure, causing a leaning of the mixture as altitude increases.
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Aneroid devices _ the term means " without liquid " _ use metal that acts like a spring to measure blood pressure.
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One study, he said, indicated that 30 percent of the aneroid devices in use in doctors'offices and hospitals were inaccurate.
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The Mayo Clinic switched to aneroid devices and checks them annually, said Dr . Sheldon Sheps, an emeritus professor of medicine there.
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Aneroid barometers sold for domestic use typically have no compensation under the assumption that they will be used within a controlled room temperature range.
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The town of Rass has a typical desert climate, known for its cold winters and hot and aneroid summers, with low humidity.
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For example, an aneroid barometer uses the angular position of a needle as the signal to convey the information of changes in atmospheric pressure.
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In 1962, the hand-winding wristwatch, Bivouac, which was the first ever mechanical watch with altimeter & aneroid barometer was launched.
