A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveries. Adapted to the use of schools and academies, and of the general reader (1850)
Olmsted, Denison, 1791-1859 · New York, R. B. Collins · leaf 267
ouble stars 1 22 254 FIXED STARS. scopes united with the most acute powers of observa-tion. Indeed, certain of these objects are regarded asthe severest tests, both of the excellence of the instru-ment and of the skill of the observer. The followingdiagram represents four double stars, as seen with… … 314. Our knowledge of the double stars almost com-menced with Sir William Herschel, about the year 1780.At the time he began his search for them, he was ac-quainted with only four. Within five years, he discov-ered nearly 700 double stars.* In his memoirs, pub-lished in the Philosophical…
Astronomy
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