Brewster's kaleidoscope

Brewster's kaleidoscope

The kaleidoscope is an example of reflective symmetry, it shows an apparently infinite number of coloured patterns from the ten fixed specimen cells that accompany it. However it also has a mask which fits over the end of the tube which allows the viewer to see the patterns that are created by looking at the surrounding scenery.

This apparatus consists of a tube with two very accurately angled and tapered mirrors inside. Light entering the front of the tube is reflected between the mirrors and is focussed at the eyepiece. By rotating the tube it gives the illusion of a continuous symmetrical pattern created from a triangular segment of the object at the end of the tube.

This light kaleidoscope was invented by the Scottish physicist David Brewster. They were known as a philosophical toys, because they combined scientific principles with entertainment. Brewster also invented the stereoscope and the polyzonal lens more popularly known today as the Fresnel lens, named for the Frenchman who adopted the principle in order to make lighthouse lenses.

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