Smith, Hamilton Lanphere, 1819-1903. [from old catalog] · Cleveland, M. C. Younglove and company · leaf 86
e limb of the instrument E F, into smallerportions, usually into minutes. When the index is set to 0, andthe eye applied at D, the observer will perceive, if he looks throughthe horizon glass at the horizon, that the portion of the horizonglass which, being silvered, would prevent his looking…
Astronomy · Meteorology · Geology · Paleontology
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