An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 76
othe building as to be as free as possible from all agitation. Infigure 14, AD represents the telescope, E, W, massive stone pillarssupporting the horizontal axis, beneath which is seen a spirit level,(which is used to bring the axis to a horizontal position,) and n avertical circle graduated into… … 122. Various methods are described in works on practical as-tronomy, for placing the Transit Instrument a(5curately in themeridian. The following method by observations on the polestar, may serve as an example. If the instrument be directed 52 THE EARTH. towards the north star, and so adjusted that…
Astronomy
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