Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 176
helower disc is fixedto the barometerframe, while the otherdisc is movable by the difference in air pressure, and, through a gear to increase the motion, moves the index hand on the graduated dial. 612 a. Corrugated disc and gear. 613. BOX KITE.—A light frame ofpine, spruce, or bamboo is braced as…
Mechanical movements
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