Olmsted, Denison, 1791-1859. [from old catalog] · New York, R. B. Collins · leaf 74
wostars may be, and however the plane which passesthrough them may be inclined to the horizon, still it istheir angular distance measured on the horizon whichdetermines their difference of azimuth. Figure 13 rep-resents an Altitude and Azimuth Instrument, several ofthe usual appendages and… … a horizontal axis and capable of two motions, one in al-titude parallel to the circle abc, and the other in azimuthparallel 10 EFG. Hence it can be easily brought to 6 62 THE EARTH. bear upon any object. At m, under the eye glass of thetelescope, is a small mirror placed at an angle of 45°with the…
Astronomy
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