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Text File  |  1992-09-03  |  376b  |  10 lines
  1. Optical toy invented by the British physicist
  2. David Brewster 1816. It usually consists of a
  3. pair of long mirrors at an angle to each
  4. other, and arranged inside a triangular tube
  5. containing pieces of coloured glass, paper,
  6. or plastic. An axially symmetrical
  7. (hexagonal) pattern is seen by looking along
  8. the tube, which can be varied infinitely by
  9. rotating or shaking the tube.
  10.