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 177
ctedback upon a small plane speculum l, which is in-clined in an angle of 45° ; from this mirror they areagain reflected to a convex lens, which is fixed in theside of the tube, and converged into n, the focus of theglass, where the image appears magnified and distinctto the eye. By fixing an… … tube, in which is placed a concave metallic speculume e, with a round hole e e perforated in the middle ;f g is a small concave mirror fastened to the rod k,which is moved backwards or forwards at pleasure.If l represent an object at a considerable distance,and its rays o o, p p, enter the tube…
Physics
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