The geography of the heavens, and class-book of astronomy: accompanied by a celestial atlas (1873)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, ed, Whitall, Henry, 1819-1887? Celestial planisphere · New York, Sheldon & company · leaf 319
ise lost, so that areflector of a given diameterwill not converge as much light to a focus as a double-convexlens of the same size. In the latter case all the light is trans-mitted. Still, reflectors have been found of such power as tomelt iron, and other more difficult substances. We have now… … 680. What now shown in this chapter? What next? What is reflection, and whendtes it take place? What law governs it? Diagram. 681. How does a coitavoemirror reflect parallel rays ! Distance of focus ? Diagram. How would you constrtota concave mirror with a 10 feet focus ? 682. Is all the light…
Constellations · Stars
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