Recreations in astronomy : with directions for practical experiments and telescopic work (1879)
Warren, Henry White, 1831-1912 · New York : Harper & Brothers · leaf 82
m one end, and one-hundredth from the other. When division-lines, on measures of great nicety, get • fine to be read by the eye, we use the microscope.By its means we are able to count 112,000 lines ruledglass plate within an inch. The smallest objectthat can be seen by a keen eye makes an angle of… … G4 CELESTIAL MEASUREMENTS gular distance north or south of the equator. Thus astars place in two directions is exactly fixed. Whenthe telescope is mounted on two pillars instead of theface of a wall, it is called a transit instrument. Thisis used to determine the time of transit of a star overthe…
Astronomy
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