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 317
DOUBLE CONVEX—FOCAL DISTANCE. … 674. What is a lens? Draw and describe different kinds. 675. Refracting pcv.er ofdouble-convex lens? Focal distance? Diagram, and illustrate. 676. Hew focal dis»tenet governed ? Diagram, and illustrate. 677. What is the focal distance of • REFLECTION AND REFRACTION OF LIGHT. 311 It must be borne in…
Constellations · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
