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 603
or M will first come into parallelism with M7, when the appearanceof things will be the same as that first presented, and afterwards passingbeyond the position of parallelism, will bring the second image again tocoincide with the first. The dial of m will then show twice as large anangular movement… … Second observation. Disregarding the angular form of the telescope, suppose the observerseye to be at E, and that the object O is seen in the line G E. Another TELEMETRICAL APPARATUS. 587 object 0, one meter distant from O, will be seen reflected from M; intliesame direction, while another image of…
Machinery · Scientific apparatus and instruments
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