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 599
nce the distance between the foci of the two lenses must be made tovary directly as the cosine of the angle of inclination to the horizon. A mechanism producing a variation according to this law is illustrated in principle in Fig. 123. Let A B be two fixed points in a horizontal bar, supported by… … TELEMETRICAL APPARATUS. 583 the extremity D of the arm pivoted at A. In consequence of the con-nection thus established, neither of the two arms can turn withoutcausing the other to turn; and with every change of position of thearms there will be a variation of the distance between the points B…
Machinery · Scientific apparatus and instruments
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