✦ LIBER ✦

An Optical Illusion

✍ Scribed by WERNDLY, L. U. H. C.

Book ID: 109446192
Publisher: Nature Publishing Group
Year: 1907
Tongue: English
Weight: 249 KB
Volume: 77
Category: Article
ISSN: 0028-0836
DOI: 10.1038/077031c0

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## AN OPTICAL ILLUSlON. --A number of years ago, I observed the following illusion. When the eye watches for some time, in complete darkness, a motionless object of small diameter, and feebly lighted, it very often happens that this object appears clearly to move with a certain rapidity in a spec