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 #:
00065
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-PHOTOGRAPHY 47 which served to rotate the picture-disc; a motion which in an improved form is still frequently applied to the modern moving band. A two-sector shutter was geared to eclipse the light when either of the two pins caused the design-wheel to move. So far as can be traced, all photographic efforts were limited to posed subjects up to 1870 ; the February of which year saw the exhibition of Mr. Heyl's Pliasmatrope at the Academy of Music in Philadelphia, and, though very successful, this apparatus was based on the synthesis of poses and not cf analytical photographs secured from a moving figure. As shown in Fig. 49, the apparatus consisted of a large wheel con- taining nine divisions, each of which was furnished with two openings for the purpose of carrying transparencies. The whole disc could be revolved, step by step, by means of a ratchet and pawl worked by hand through a reciprocating bar. A shutter, operated by the same means, was so arranged as to cover the pictures during the whole period of substitution. The transparencies were prepared from posed subjects, such as the six different positions in a waltz, etc., the figures being three-quarters of an inch in height and projected to life size. The negatives were wet collodion, and that is sufficient reason why posing was necessary; putting the question of time required for exposure on one side, there still remained the difficulty of rapidly substituting a fresh sensitive surface for the one just exposed, and this difficulty could not be fully overcome until the introduction of Fig. 49.