The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

Record Details:

Title:
The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular
Date:
1877
Publisher:
Philadelphia, J. A. Moore
Volume:
The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular
Leaf #:
00085
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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76 SCIOPTICON MANUAL. find the Sciopticon very useful in sketching their pictures. Having first obtained a glass positive or negative of the subject to be painted, it can be thrown upon the canvas of the size desired, and expeditiously and accu- rately traced. It saves valuable time to the good artist, and it prevents the poor artist from producing distor- tions. WOODBURT PHOTO-RELIEF EXCELSIOR LANTERN SLIDES. By JOHN C. BROWNE. While it is a comparatively easy matter to produce fine positives by either the wet or dry process of pho- tography, yet the results are liable to vary somewhat even in the hands of the most careful manipulator. The Woodbury photo-relief process, as now worked in Phila- delphia, has the merit of distancing all competition in the uniform excellence of its lantern slides. It would be a pleasure to give in detail a description of this won- derful process, did space permit, commencing with the sensitive gelatine tissue, resembling in appearance a piece of patent leather, and following it in its exposure to light under a negative, the light's action rendering insoluble those parts reached through the negative; its subsequent immersion in hot water dissolves out those parts not rendered insoluble, producing a relief as thin as writing paper, which when dry is pressed into a piece of soft metal by a hydraulic press of fabulous power, forcing this delicate substance into the smooth metal, and leaving upon its surface a counterpart or mould of all its finest lines and half tones. Strange to say this flimsy gelatine relief is not crushed to atoms by this