| 摘要 |
A kaleidoscope or teleidoscope is provided in which the viewed object is an image focused onto a back-projection screen positioned at the objective end of the mirror system. Focusing may be by a pair of achromatic lenses which may be displaceable toward and away from the screen and the screen preferably comprises a wax layer sandwiched between glass plates one of which is in contact with the objective ends of the mirrors. In one embodiment an illuminated soap bubble in a glass globe is viewed through a kaleidoscope the length of which is reduced by redirecting the image by means of mirrors.
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