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 602
586 PARIS UNIVERSAL EXPOSITION. axis of the box; and that the telescopes are parallel to each other, theiraxes being at right angles to that of the box. By turning the wholenstrurnent about its pivot, let the image of a distant point as seen byreflection in the mirror M be brought to coincidence…
Machinery · Scientific apparatus and instruments
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