Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 372
s on a platform which rises or fails, or at great elevation upoaBhding galleries which draw out from the walL This telescope commands an immense field of vision, and it is said that ob-jects as small as 100 yards cube, can be distinctly observed by it in the mooaat a distance of 240,000 miles.*… … It consists of a metallic box, or lantern, A A, Fig. 306, containing a lamp,L, behind which is placed a metalhc concave mirror, p q. In front of thelamp are two lenses, fixed in a tube projecting from the side of the lantern,one of which, m, is called the illuminator, and the other the magnifier.…
Physics · Science · Technology
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