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 114
g powers—as 6X, 7X, 8X, 9X—are usually specified upon the frameor body of the glass. The symbol X means times and represents the times an objectis magnified, or the extent to which the apparent diameter of an object is increased. Inthe same way we say that a glass or telescope has a power of 8 or… … HIGH POWER, PRISM BINOCULAR,FIELD-GLASS On Tripod Support 100 a Beoiniiers Star*Boo{? much satisfaction can be found in powers as high as lo, 12, 15, or even 18. Prism binocularsmay be had in all these magnifications and if care be taken to select a model having largeobject lenses, and thus…
Astronomy
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