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 #:
00077
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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CllRONO'PHOTOGRAPHY. 69 Still at best the Photographic Revolver was but an observing- instrument, and little could be done in the way of combining the distinct views into one motion ; forty-eight separate pictures at the rate of twelve per second would only last the fifteenth part of a minute, and even then would compress the events of seventy- two seconds into that time. To obtain a longer series^ Donisthorpe in 1876 further developed Du Mont's idea of rapidly dropping an exposed plate into a lower chamber, so leaving the next free for exposure, and provided a special gearing by which the shutter covered V\c,. 62. the lens during the change. Nevertheless, Janssen's instrument was the model on which Marey founded his Photographic Gun, which was of real value for analysing motion in such a way that it could be subsequently re-compounded by means of the Zoetrope. Its name was well chosen, and is perfectly descriptive of the apparatus shown in Fig. 62. The length of barrel was necessitated by the use of a long-focus lens, which was, of course, absolutely indispensable when photographing a small object at a considerable distance. This barrel was arranged so as to telescope for focussing purposes. The breech contained clock- work mechanism for effecting the series of exposures,