A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 272
is meant by the Camera Obscura ? How is THE CAMERA OBSCURA. 267 on a white ground at its focus. Such an arrangement iscalled the Camera Obscura, or dark chamber. For practical purposes, the camera obscura must beportable. A close box, painted black on the inside, istherefore substituted for the… … DRAUGHTSMAN 702. Draughtsmans Camera.—Fig. 256represents the camera as used by draughts-men. To be conveniently traced, the imagemust be thrown pn a horizontal surface, andthis is effected by making the opening in thetop of the box and receiving the rays on amirror, A, inclined at an angle of…
Physics
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