Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 440
suggested to Sir David Brewster the construc-tion of the instrument so well known as the kaleidoscope, in which two—or,still better, three—mirrors of black glass, or of glass blackened on one side,are placed in a pasteboard tube inclined to each other at 60° : one end of••the tube is closed by two… … Fig. 197.—Polemoscope. the instrument arranges in new combinations. At the other end of thetube is a small opening—on applying the eye to which one sees directlythe fragments of glass, with their images so reflected that beautifullysymmetrical patterns are produced; and this with endless variety.…
Inventions
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