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 #:
00022
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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SCIOPTICON MANUAL. 13 EXPERIMENTAL VERIFICATION. These properties of the camera obscura, thus far con- sidered, may receive more lively illustrations by actually darkening a room and admitting light through, say an inch hole. A room with but one window, and that looking from the sun, and towards objects illuminated by sunlight, is to be preferred. A lens, if one is used, of long focal distance (nearly flat) gives more room for spectators before the screen. The images, if the lens has short focus, may be better seen on the back of a semi-transparent screen by transmitted light, as they are seen on the ground-glass in a photographic camera. These moving pictures of busy life and wavy trees, of curling smoke and floating clouds, are peculiarly pleasing and beautiful, as well as suggestive of im- portant principles in optics. INDISTINCTNESS. Fig. 1 fails of showing the divergence of each pencil of light to the size of the aperture as seen at c (Fig. 3); Fig. 8. a property which renders the image indistinct, from the consequent overlapping of the blunt ends, so to speak, of innumerable pencils. CONVEX EENS. In accordance with the law of refraction, rays as from d (Fig. 4) are bent towards a perpendicular in entering the convex lens /, and from a perpendicular in