Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 172
will be presentedin a proper position upon the receiving table in thefocal point of the lens, giving the most beautiful andanimated representation of all the surrounding objectsin their own colours. Magic lantern. This amusing machine is madeto magnify small pictures, which are painted uponglass,… … ife *ide: g h is a thick plano-convex lens, which W 170 BURNING GLASS. TELESCOPES. strongly illuminates the object e f when it is put in-verted into the tube : k is a concave reflecting minor,to give additional force to the light ; and A b is adouble convex lens, placed in a movable tube,…
Physics
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