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 82
titudes, therefore, two stars may be, andhowever the plane which passes through them may be inclined tothe horizon, still it is their angular distance measured on the hori-zon which determines their difference of azimuth. Figure 18 rep-resents an Altitude and Azimuth Instrument, several of the… … telescope mounted on a horizontal axis and capable of two mo-tions, one in altitude parallel to the circle ahc, and the other inazimuth parallel to EFG. Hence it can be easily brought to bearupon any object. At m, under the eye glass of the telescope, is asmall mirror placed at an angle of 45° with…
Astronomy
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