The geography of the heavens : and class-book of astronomy : accompanied by a celestial atlas (1860)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York : Mason Brothers · leaf 314
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-convex lens ? Diagram. 678. Effect of double-com«B lens ? Amount of diver-gency of rays? 679. What articles made with double-couvex lenses ? Uses Poweof burning glasses? 312 ASTRONOMY. REFEECTION BY A PLAMH MIRROR.
Constellations · Stars
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