Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography (1899)

Record Details:

Title:
Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography
Date:
1899
Publisher:
London Optician & Photographic Trades Review
Volume:
Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography
Leaf #:
00028
Language:
English
Collection:
Books
Format:
Books
Contributor:
Robarts - University of Toronto
Sponsor:
University of Toronto
Coordinator:
Media History Digital Library
Description:
52
Date Added:
July 19, 2022
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10 LIVING PICTURES. a most effective manner, and this matter will be referred to somewhat later in its proper sequence. Probably it was due as much to the invention of the Thaumatrope as to Roget's researches on apparent deformation of the spokes of revolving wheels that attention was directed to the fruitful combined subjects of persistence of vision and rotation of a series of diagrams; for in 1831 we find several writers, including Aime and Faraday, referring to the fact that when two cogged wheels, with equal number of teeth, revolve at equal speed hi opposite directions, one in front of the other, the eye, if placed at a distance, perceives a stationary image of one wheel only. (Plateau had made the same observation in 1828.) This illusive stationary wheel merely results from the strong image perceived each time the aspects of the two wheels coincide ; the phase when the cogs of one wheel are passing over the spaces in the other forming, so to speak, a blurred background on which the strong stationary image stands out. To illustrate this Faraday constructed a demonstration apparatus called Faradays Wheel (Fig. 6), in which two discs with notched edges were revolved at equal speeds in opposite directions by friction gearing. Faraday and Plateau both investigated the results of revolving two cogged wheels in the same direction and looking through the cogs of the front one at the other ; in which case also an apparently stationary wheel was seen, though from a far different cause to that in the first case, as will be seen in the following explanation of the action of a slotted disc. Fig. 6.