Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 610
594 PARIS UNIVERSAL EXPOSITION. The graduation is the inverse of the sine of the parallax, and as,assuming in the last figure that B is a right angle— A0= ; hence ABxthe inverse of sin:r=AC; sin - - being taken to represent the parallax. To determine the divisions of the graduation, therefore, let…
Machinery · Scientific apparatus and instruments
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