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Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 259

An illustration from Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families, 1878, leaf 259
Figure 4.—Recomposition of light by means of reversedprisms. For an explanation of this diagram, see 431. 252 OPTICS. VISION. ^o9.—Figure 5.—The camera obscura.—The camera ob-scura as the name implies, is a dark chamber, and, in a portable form, Fig. 5. … is employed to take pictures of objects. In its simplest construction,it consists of a dark room, provided with a small opening, as a hole ina shutter, on one side of the room, the wall on the opposite side serv-ing as a screen, to receive the image. The principle of its operation is, that the rays…

Physics · Astronomy

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