Optical Illusions.
A correspondent in La' Nature suggests several interesting variations which may be given to the experiment with the stroboacopic circles discovered by Professor Thompson about ten years ago, and familiar to most of", our readers. Two of these variations are depicted in the cuts here etfven
These two designs are intended to be copied on cardboai'd four times larger than the original, and rapidly revolved on a pin or wive passing through the centre. Under these conditions Fig. 1 will be curiously transformed. The four circles will disappear and change into a single circle, the circumference of which is bounded by the centres of the real circles : outside of this spectral circle numerous half circles appear
When Fig. 2 is rotated on its axis the parallel lines disappear and become •onverfed into concentric circles. •
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Te Aroha News, Volume VI, Issue 327, 22 December 1888, Page 4
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136Optical Illusions. Te Aroha News, Volume VI, Issue 327, 22 December 1888, Page 4
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