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)
In the dark box is provided a plane mirror, M, inclined at an angleof 45°, upon which the rays S, coming from the object or scenery, arereceived, and by which they are reflected upward to a glass plate ortransparent screen, upon which is laid the paper P, and on which thetracing is made. The lens,… … 484- Figure 21.—Another form of the camera obscura. —Upon the frame, FF, is mounted a horizontal head-piece, in which isFig. 21. fitted a plane mirror, M. To exclude the light, a black cloth is thrown overthe frame. The rays of the object. A, orscenery, are received upon the mirrorand reflected…
Physics · Astronomy
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