Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 349
o reflect the rays which enter it upon a convex lensfixed at the extremity of a tube. This reflection inverts thebeam of light and makes the image erect, which may thenbe thrown upon a suitable screen for observation. Such images are perfect representations of the external objectswhich they… … Fie. 2&). { 334.) How arc the images made ere*i? OPTICAL INSTRUMENTS. 347 The Portable Camera for Artists. 335. For taking views, the camera obscura should helight and portable. The best form is that shown in Fig. 230.It consists of a sort of portable tent of black cloth, withinwhich is a table…
Physics
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