The geography of the heavens and classbook of astronomy; (1863)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868, Whitall, Henry, 1819-1887? Celestial planisphere. [from old catalog] · New York, Mason brothers; Boston, Mason & Hamlin; [etc., etc.] · leaf 313
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… … jMno-convex lens ? Diagram. 678. Effect of double-conmx lens ? Amount of diver-gency of rays? 679. What articles made with double-convex lenses ? Uses? Powe*of burning glasses ? 312 ASTRONOMY. UK FUNCTION OF MCI IT. i;i:n tvnoN HY
Constellations · Stars
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