A SIMPLE OPTICAL DELUSION
An* interesting optical experiment may be made with the ordinary incandescent light. Gaze steadily at the light for a few seconds, then suddenly extinguish it. The experiment (says the Baltimore Sun) is best performed in a dark room. In about half a minute you will see the perfect image of the light, with the fine strands of wire plainly visible. It will bo red at first. In a few minutes it will turn purple, and then a bright blue. Later it will apparently move to the right. As you turn your gaze it will continue moving to the tight, If you keep your gaze fixed, it will come brick. It is surprising 'long the illusion will hist. It will be seen for fully live minutes, perhaps longer, and if you turn on the light and look away from it von will see the old image for several minutes, though more faintly than in the darkness.
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Bibliographic details
New Zealand Herald, Volume XLIV, Issue 13537, 7 September 1907, Page 5 (Supplement)
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159A SIMPLE OPTICAL DELUSION New Zealand Herald, Volume XLIV, Issue 13537, 7 September 1907, Page 5 (Supplement)
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