Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 383
z is a goodexample of a pair ofstars that can barely beseparated with a goodeye. Figs. 407 and 408show this pair as it ap-pears in telescopes mag-nifying respectively fourand fifteen times; andFig. 409 shows it as seenin a more powerful tele-scope, in which each of F,g- 4°9the two components of the…
Astronomy
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