The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J. (Charles Joyce), 1839-1917 · New York, J. Wiley & sons; · leaf 43
xtremityof which is represented by B. Thissecond axis carries the telescope, TT>and also a second graduated circle,CC, whose plane is perpendicular to^g. ii. that of the circle CC. 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. 39 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, AAflies in a vertical direction, we shall have an altitude and azimuthinstrument, sometimes called…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)](https://img.insideoutlibrary.com/img/200/ia-62523189.5956.emory.edu-533-122.webp)
