Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 144
e that it would require thecollective light of many thousands to be visible to the un-aided eye. Eeflecting Telescopes.—One of the essential parts of a refractingtelescope is the object-glass, which brings all the incident rays froman object to one focus, forming there an image of that object.… … Fig. 68.—Theory of the Reflecting Telescope. which, after impinging on it, are brought by reflection to one focusF. The image formed at this focus can be viewed with an eyepiece,as in the case of the refracting telescope. The eyepieces used with such a mirror are of the kind already de-scribed. In…
Astronomy
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