The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 44
extremityof which is represented by B. Thissecond axis carries the telescope, TTyand also a second graduated circle,CC, whose plane is perpendicular to^g. ii- that of the circle C C. The tele- scope admits of being moved in the plane of each circle, and tion and other causes, which will be… … ALTITUDE AND AZIMUTH INSTRUMENT. 59 microscopes or verniers are attached to the instrument, by meansof which arcs on either circle can be read. If this instrument is so placed that the principal axis, AA,lies in a vertical direction, we shall have an altitude and azimuthinstrument, sometimes called…
Astronomy
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