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 #:
00095
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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CHRONO.PHOTOGltAPHY, 77 at so high a speed is worthy of all praise; but it must not be overlooked that the system itself was faulty, and totally precluded use of the apparatus for projection purposes. A glance at Fig. 76, which shows the shutter and film in plan, will demonstrate the enormous waste of light involved by Mr. Edison's arrangement. The slot was only one degree in width, and therefore only one - three - hundred - and - sixtieth part of the available light was allowed to pass to the eye. Under these circumstances no known source of light would be power- ful enough to stand the waste in projection work, while a camera arranged on the same principle would be an impossibility; an attempt to secure forty-six pictures per second would necessitate exposures of less than the sixteen-thousandth part of a second, a period too brief for the most sensitive emulsion to cope with. An entirely different arrangement was therefore adopted in order to secure negatives in the camera, but little information was allowed to tran- spire ; and although the patent speci- fication was filed in the United States on August 24th,. 1891, the patent itself was not issued until more than six years had passed away. Up to the 31st August, 1897, it was only known, in vague terms, that Mr. Edison. Fig. 77.