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
being placed in the angle to changethe direction of the rays by total reflection. Theeye-pieces of these telescopes are presented atright angles to the axis of the box in opposite directions. The distancebetween the centers of the mirrors is one meter. In the sides of the boxopposite the mirrors…
Machinery · Scientific apparatus and instruments
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