A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 223
instances, they havebeen so placed as to fire acannon in clear weather, byigniting the priming at 12oclodk. The adjoining cut represents a large burn-ing-glass converging the rays of the sun to afocus, and setting combustible substances onfire. Such glasses have been made power-ful enough to melt… … ESFLBCTION BY A PLANE MIRROE. REFLECTION OF LIGHT. 504. We have now shown how light may be turnedout of its course, and analyzed, dispersed, or convergedto a point by refraction. Let us now consider how itmay be converged to a focus by reflection. 505. When light falls upon a highly polished…
Astronomy
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