. Barometers and the measurement of atmospheric pressure. A pamphlet of information respecting the theory and construction of barometers in general. Barometers; Meteorological instruments. riGURE 18.—Dial barometer FiGUsa 19.—Sympiesometep When a change of pressure occurs the cistern is caused either to ascend upon a barometer tube or to move down to a new position of equilibrium, and, by selecting suitable proportions between the inter- nal diameter of the barometer tube and the thickness of its walls in relation to the diameters of the core and cistern, the movement of the latter up and down
. Barometers and the measurement of atmospheric pressure. A pamphlet of information respecting the theory and construction of barometers in general. Barometers; Meteorological instruments. riGURE 18.—Dial barometer FiGUsa 19.—Sympiesometep When a change of pressure occurs the cistern is caused either to ascend upon a barometer tube or to move down to a new position of equilibrium, and, by selecting suitable proportions between the inter- nal diameter of the barometer tube and the thickness of its walls in relation to the diameters of the core and cistern, the movement of the latter up and down the tube with changes of atmospheric pressure can be made to represent pressures upon a greatly magnified scale. 66. Magnifying siphon harometer.—Figure 21 illustrates still an- other expedient by which the indications of a plain mercurial barom- eter may be greatly magnified. The short leg of a siphon barometer is extended upward, in the manner shown. The small-bore tube a is enlarged at the top to have the same diameter as the cistern Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marvin, Charles F. (Charles Frederick), 1858-1943. Washington, U. S. Govt. print. off.
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Keywords: ., bookcentury1900, bookpublisherwashingtonu, booksubjectbarometers
