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 #:
00021
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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12 SCIOPTICON MANUAL. MAONIFIEI* IMAGE. This rule works both ways; for suppose a screen to bo suspended in place of the man, the space being dark- ened, and suppose the three-inch inverted image to bo "fixed" and highly illuminated, then a secondary imago will be projected upon the screen ten feet from the lens, corresponding to the original object in size and position. INFERENCE 1. A good portrait objective for the camera is also suitable for a lantern objective; for the lines of light and the angles are in both cases the same. INFERENCE 2. The light, if reflected from the three-inch picture, radiates so as to cover 100 times as much surface on the magnified image. How, as a very small fraction of this reflected light is re-reflected to the eye of the observer, it seems a hopeless undertaking, to make the opaque lan- tern practically useful in showing the images of small paper photographs, on a large scale, with any ordinary flames, however well arranged. INFERENCE 8. With an intense light at a point behind the three-inch transparency, converged by a condenser, so as to enter the objective through all points of the picture, the mag- nified image is illuminated with incident rays concentra- ted, and its exhibition becomes a success. INFERENCE 4. Additional light outside this point (as some recom- mend), would not fall in line with the objective so as to improve the illumination; while the additional heat and diffused light would be very objectionable.