A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 56
Fig. 19. — The Meridian Circle (Schematic). ASTRONOMICAL INSTRUMENTS. 43 … Fig. 20. —Transit Circle of the Princeton observatory. A, /?, C, D, the Reading Microscopes.A, the Graduated Circle.//, the Roughly Graduated Setting Circle./, the Index Microscope. This is usually, however,placed half way between A and D. /•, the Clamp. G, the Tangent Screw.LL, the Level, only…
Astronomy
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