A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope (1912)
Murphy, Edgar Gardner, 1869-1913 · New York, London, G.P. Putnam's Sons · leaf 113
ellations. Evenafter the telescope has been adopted and is well understood, an opera-glass is often ofdefinite service in examining unfamiliar star-fields—especially upon dull or hazy nights—in order that the larger instrument may be intelligently directed. As with all optical products these vary… … field-glass: prism binocular type glasses. Often the same glass that has been used for years at the theatre is also quitesatisfactory for the study of the stars. The best for this purpose are undoubtedly thosehaving large object lenses,—the object lenses are at the end nearest the object viewed;…
Astronomy
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
