Smith, Hamilton Lanphere, 1819-1903. [from old catalog] · Cleveland, M. C. Younglove and company · leaf 53
is 50 THE WORLD. line, suppose the star to be upon it. As the earth turns on its axis,the star is left behind, and after a complete revolution, the meridianagain arrives to it, this interval is called a sideriuPday, or day asdetermined by the stars, and to ascertain this day, or its length,we must… … The ordinary transit instrument consists of a telescope, A B, ofany convenient length, fixed firmly at right angles to a conicalhollow axis, E F, the extremities of this axis are truly turned,and rest in two angular bearings which are called Ys, since theyare not unlike this letter, the instrument…
Astronomy · Meteorology · Geology · Paleontology
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