Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 43
general principles on which the altitude and azimuthinstrument is constructed are seenin Fig. 11. Through the centre ofa graduated circle, CC, and per-pendicular to its plane, is passed anaxis, AA. At right angles to thisaxis is a second axis, one extremityof which is represented by B. Thissecond… … tion and other causes, which will be explained in Chap. III., the directionin which it really lies, certain small corrections must be applied to thereading of the circle to obtain the reading which really corresponds to thedirection of the star. ALTITUDE AND AZIMUTH INSTRUMENT. 39 microscopes or…
Astronomy
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