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James Lind's anemometer of 1775 consisted of a vertically mounted glass U tube containing a liquid manometer (pressure gauge), with one end bent out in a horizontal direction to face the wind flow and the other vertical end capped. Though the Lind was not the first, it was the most practical and best known anemometer of this type.
Devices used to measure weather phenomena in the mid-20th century were the rain gauge, the anemometer, and the hygrometer. The 17th century saw the development of the barometer and the Galileo thermometer while the 18th century saw the development of the thermometer with the Fahrenheit and Celsius scales.
The difference in liquid levels represents the applied pressure. The pressure exerted by a column of fluid of height h and density ρ is given by the hydrostatic pressure equation, P = hgρ. Therefore, the pressure difference between the applied pressure P a and the reference pressure P 0 in a U-tube manometer can be found by solving P a − P ...
All we are talking about is scale. a manometer is a pressure guage that measures the pressure by measureing the weight of the column of air above it based on a reference weight on top of the column pushing down, this can be acheived in many different design methods. Hence, all manometers are pressure guages but all pressure guages are not ...
Further, the vacuum in the gauge eventually deteriorates due to slow diffusion of gases through the mercury, making the device inaccurate. [8] In 1938, Adolph Zimmerli (1886–1967) [9] invented a gauge that overcame the filling problems, at least for pressures below ambient pressure. [10] Zimmerli's gauge consists of three relatively wide columns.
A submersible pressure gauge is used to keep track of the contents of the diver's air tank. Another gauge is used to measure the hydrostatic pressure, usually expressed as a depth of sea water. Either or both gauges may be replaced with electronic variants or a dive computer. [37]
Gauge (engineering) A highly precise measurement instrument, also usable to calibrate other instruments of the same kind. Often found in conjunction with defining or applying technical standards . Gradiometer any device that measures spatial variations of a physical quantity .
This test was essentially the first documented pressure gauge. In 1647 Valerianus Magnus published his Demonstratio ocularis , in which he claims to have proved the existence of the vacuum in the court of the king of Poland, Ladislaus IV , in Warsaw by means of an experiment identical to that carried out by Torricelli three years earlier.
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