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 318
ey have been so placed, as to fire acannon in clear weather, by igniting the prim-ing at 12 oclock. 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 powerfulenough to melt the most… … plano-cowex lens? Diagram. 678. Effect of double-canvex lens? A jfency ofrays? WJ. What articles made with double-convex lenses? Uses? l»owe( »f burning glasses ? 312 ASTRONOMY BEFEECTION BY A PLANE JIlUKOlt.
Constellations · Stars
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