The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 313
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 whendoes it take place? What law governs it? Diagram. 681. How does a concavemirror reflect parallel rays ! Distance of focus ? Diagram. How would you constructa concave mirror with a 10 feet focus ? 682. Is all the light…
Constellations · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-233-142.webp)
