[Clarke, William], 1800-1838 · Boston, Munroe and Francis · leaf 114
ficom disturbing the picture ;let it be two feet and a half long, and eighteen or twenty inches high ; bendthe length of it inward, to the form of part of a circle, the diameter of whichis equal to double the focal distance of the glass : then fix it on a frame of thesame figure, and place it upon… … 112 OPTICAL AMUSEMENTS. front of the window will be painted upon the paper, in an inverted position^with the greatest regularity, and in the most natural colors. There is another method of making the camera obscura, by a scioptricball; tliat is, a ball of wood, through which a hole is made, in…
Sports · Amusements
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