Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 24
ng and moving about with the wind, thus traces an ir-regular line on the cylinder. If the fly revolves in the simple proportion of the velocity of the wind,the length of line marked by the pencil is proportional to the space which would be described by a par-ticle of air in a given direction in a… … 20 ANEROID BAROMETER. tered on a paper placed on a board moved by means of clock mechanism. The pressure is measuredby a plate always directed so as to face the wind. Three pencils are used, of which one registers thepressure of the wind in pounds per square foot, another the direction of the wind,…
Mechanical engineering
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