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 #:
00083
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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74 SCIOPTICON MANUAL. 4. The apparatus may stand within reach of the operator. 5. It requires no previous preparation more than having clean glass, and chemicals in good working order. 6. The albumen coating is not required to make the film adhere. 7. The amount of exposure can be definitely gauged. 8. The illumination is confined to a narrow cone, so as not to fog the picture by diffused light. 9. The exposure is so immediate and uniform as to escape many accidents. 10. It is so easily done, that many causes of failure involved in a long process are not encountered. 11. The negative is not marred by use as in contact- printing. 12. This apparatus complete costs but seven dollars. Thus we have in it advantages by the dozen. THE SCIOPTICON PROCESS. By placing the Sciopticon near a wall, in a dark room, and drawing forward its extension front, an image of a negative may be projected into a three-inch circle. First focus sharply on a paper-covered glass, and then expose a wet plate in the same place a minute, more or less, developing and fixing as usual, and we have a glass posi- tive photographed by the Sciopticon for the Sciopticon. The objective is always used with full opening, because all the light is needed, and because it will not give an evenly illuminated disk with a small stop; so we cannot secure perfect sharpness to the very edges. It answers well, however, for central figures, and the photographer can easily produce unexceptionable positives from his