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Convex Lens
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Description: "A modification of the simple kaleidoscope was introduced by Sir David Brewster, whereby the images of large and distant objects can be introduced into the picture. This is effected by removing the object box and replacing it by a tube carrying at its outer end a double convex lens, represented by LL. By a screw adjustment the lens can be so placed as to focus the distant object exactly in the plane of the sector AOB, and so bring its image into the very best position for producing symmetrical patterns. When this instrument is directed towards a tree in full bloom, a very beautiful effect is produced, which can be varied by gradually moving the instrument. This form was called by Brewster the telescopic kaleidoscope." —The Encyclopedia Britannica, 1910
Source: The Encyclopedia Britannica, New Warner Edition (New York: The Werner Company, 1893)XIII:828
Keywords: Convex, Lens, Kaleidoscope, Brewster, Symmetrical,
Copyright: 2009, Florida Center for Instructional Technology. See license.
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