The geography of the heavens and classbook of astronomy; (1863)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, Whitall, Henry, 1819-1887? Celestial planisphere. [from old catalog] · New York, Mason brothers; Boston, Mason & Hamlin; [etc., etc.] · leaf 314
t, bo that areflector of a given diameterwill not converge as much light to a focus as a double-convex lens ol the same size. In I he la tier ease all the lighl is I rans- mitted. Still, reflectors have been found of such power as to melt iron, and Other mere difficult snhslanees. We have now… … 880. What now shown la this chapter? What next? What Is mdwhen ♦iocs a. take place? What lavi governs It? Diagram, 681. How -imirror refleot parallel pays I Distance ol focus? Diagram How would you constructa oonoave mirror with a 10 feet foous? 082, la all the light falling upon a polishedsurface…
Constellations · Stars
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