Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration (1906)

Page scan 000448 from Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration

Record Details:

Title:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Date:
1906
Author:
Wright, Lewis, 1838-1905
Publisher:
London, New York, Bombay : Longmans, Green and Co.
Volume:
Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration
Leaf #:
000448
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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APPENDIX 433 (fig. 244) has an entirely open stage, even the clip for lantern-slides being key-holed on to the front, so as to be instantly removable. A prism fitted on the front erects the image if required, or can be taken off if not wanted. The front can be hinged up and a mirror slid in, which changes the lantern instantly from a horizontal to a vertical instrument. The above-mentioned prism, turned on a pivot into another position, now serves to reflect the image on to the screen. n m § Fio. 244.—Prof. Jackson's Science Lantern This arrangement is extremely convenient for demonstrating objects that require to be kept horizontal, such simple experiments, for example, as the arrangement of lines of force shown by dusting iron filings over a magnet are easily shown. Such a lantern is also very useful as a substitute for black- board illustrations. A piece of finely ground or smoked glass being laid on the horizontal surface of the condenser, the operator standing in front of the lantern can draw or write at will with a pencil or needle-point, and the drawing is represented on the screen as he proceeds. The bar and lens of this lantern can be removed, leaving the F F