Scientific amusements . Plateaus Phenokistoscope {see page 63). given, and thus the Zootrope might be quite a vehicle ofinstruction as well as of amusement. This instrument iscertainly one of the most curious in the range of optics,and never fails to excite interest. The ingenious con-trivances which have up to the present time, reproduced it,all consist in the employment of narrow slits, which besidesreducing the light to a great extent, and consequently thelight and clearness of the object, require the instrument to THE PRAXINOSCOPE. 81 be set in rapid rotation, which greatly exaggerates the
Scientific amusements . Plateaus Phenokistoscope {see page 63). given, and thus the Zootrope might be quite a vehicle ofinstruction as well as of amusement. This instrument iscertainly one of the most curious in the range of optics,and never fails to excite interest. The ingenious con-trivances which have up to the present time, reproduced it,all consist in the employment of narrow slits, which besidesreducing the light to a great extent, and consequently thelight and clearness of the object, require the instrument to THE PRAXINOSCOPE. 81 be set in rapid rotation, which greatly exaggerates therapidity of the movements represented, and without whichthe intermissions of the spectacle could not unite in acontinuous sensation. We present on page 83 an apparatus based on a verydifferent optical arrangement. In ^ePraxinoscope * (a namegiven by the inventor, Mr. Reynaud, to this new apparatus),. The Zootrope. the substitution of one object for another is accomplishedwithout interruption in the vision, or solution of continuity,and consequently without a sensible reduction of light;in a word, the eye beholds continuously an image which,nevertheless, is incessantly changing before it. The resultwas obtained in this manner. Having sought unsuccess-fully by mechanical means to substitute one object foranother without interrupting the continuity of the spectacle,the inventor was seized with the idea of producing this * Yxova praxis, action, and skopein, to show 82 OPTICAL ILLUSIONS.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
