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Third Dimension Movies And E X P A N D E D Screen (1953)

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38 THREE-DIMENSIONAL MOTION PICTURES tina of the observer before the Impression of the other face had completely vanished. This experiment led Doctor Finton, the following year, to construct a little, simple toy consisting of a round card on one face of which a cage was drawn and on the other face a bird. By spinning the card on its axis the effect was obtained that the bird appeared to be in the cage. This instrument was called the "T/iaum- athrope" Quite recently jewelry trinkets were in demand con sisting of a gold disc on one face of which portions of a word or phrase were engraved and the remaining portion of the same word or phrase was also engraved on the other face. The disc was so mounted that it could easily be spun and by doing so the whole word or phrase could be read in its entirety. Although the phenomenon was mentioned by Leo nardo da Vinci, in 1472, it is quite impossible to fix with exactness the very beginning of the application of the persistence of vision to practical experiments or in struments. It is an historical fact that Newton, about