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

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 #:
000449
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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434 OPTICAL PROJECTION condenser entirely free, or a simple microscope, polariscope, or other attachment can be key-holed on in place of the slide stage. For another 63s. the lantern can be supplied with an entirely removable front, and a long solid baseboard can then be fitted with a large projecting microscope, or, indeed, any optical apparatus ; or at another slight extra expense the lantern can be supplied with the bar carrying the lens entirely sunk in the baseboard, thus carry- ing the ' open stage' idea to perfection. About eighteen months FIG. 245.—Prof. Jackson's Science Lantern adapted for Opaque Work ago I endeavoured to improve this lantern still more by adapting it also for opaque work. This was finally achieved by tilting the whole lantern up from the back so that it threw a powerful beam of light down on to the baseboard. Any opaque object up to about 5 inches square placed thereon, being thus strongly illuminated, can be projected on the screen by means of the usual lens and prism, and the lantern in a moment can be dropped down again and used as just described for either horizontal or vertical work (fig. 245). For all-round useful work at a moderate price this lantern is hard to beat.