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 322
698. This is the largest refracting telescope ever constructedThe object-glass is two feet in diameter, with a focal distance of16 feet. The tube is of heavy sheet iron, and shaped somewhatlike a cigar. It is 13 feet in circumference in the largest place,and weighs about three tons. This telescope…
Constellations · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
