. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 instrument known as the aneroid barometer. The term "aneroid" means without fluid. The aneroid barometer,then,i6afluidlessbarometer, utilizing the change in shape of an evac- uated metal cell to measure variations in atmos- pheric pressure. The aneroid barometer gets its name from the pressure-sensitive element used in the in- strument. It is an aneroid, which is a thin- walled metal capsule or cell, sometimes called a diaphragm, that has been either partially or completely ev
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 instrument known as the aneroid barometer. The term "aneroid" means without fluid. The aneroid barometer,then,i6afluidlessbarometer, utilizing the change in shape of an evac- uated metal cell to measure variations in atmos- pheric pressure. The aneroid barometer gets its name from the pressure-sensitive element used in the in- strument. It is an aneroid, which is a thin- walled metal capsule or cell, sometimes called a diaphragm, that has been either partially or completely evacuated of air. The aneroid is usually made of beryllium copper or phosphor bronze. Most aneroid cells in the currently used aneroid barometers are self-supporting, and do not require external or internal springs to prevent the crushing of the cell walls by atmospheric pressure. In a common type of single aneroid cell barometer, the top of the evacuated cell is secured to a suitable linkage which transmits the motion of the aneroid to an index hand or pointer, which indicates the pressure. (See fig. 2-6.). Figure 2-6 <—Simple diagram barometer. of the aneroid Precision Aneroid Barometer (ML-448/UM) The Precision Aneroid Barometer (ML- 448/UM) is used aboard ship and at land stations. Of precision design and manufacture, the precision aneroid barometer is constructed to accurately indicate atmospheric pressure in millibars or inches of mercury. (See fig. 2-7.) The pressure element of the precision aneroid is a Sylphon cell, which consists of a bellows- shaped metal cell having an internal spring to provide pressure calibration. This element is sensitive to minute variations in atmospheric pressure. The Sylphon cell is connected to an indicating pointer or index by means of a quadrant gear and lever system in such a manner that the movement of the cell, for a given change in atmospheric pressure, is greatly magnified by the linkage. This pressure variation is then tra
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