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

Page scan 000284 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 #:
000284
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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SOUND 269 horizontally in one of the sockets of a pillar-stand, so as to be adjusted at the height of the optic axis of the lantern. On the large open end, fit any of several short brass tubes, over which are strained membranes of very thin rubber, held by elastic bands catching in grooves cut round the ends of these short tubes. On these membranes mirrors are cemented; and by stretching the rubber a little one side or the other, or by changing one of these caps for another, a good position is sure to be readily obtained. This is a very simple, easy, and elegant experiment. 147. Manometric Flames.—Another method is by Konig's manometric flames, which are projected easily, and better seen in some respects than by direct vision. They can be projected even by the simple apparatus usually sold, with capsule and revolving mirror upon one base-board ; in which case the focussing lens must be of long focus, and stand between the re- volving mirror and the screen. The lantern itself has no place in this experiment, the flame only being focussed ; and it is necessary that this be enclosed in an opaque chimney of some kind, only open towards the mirror, in order that the screen and room may be as dark as possible. I have got fair results this way ; and if more bril- liance be required, it is easily ob- tained by ' enriching' the gas, passing it through benzoline, or over naphthalene heated by a Bunsen burner in the albo-carbon manner. The flame will be very greatly brightened by this expedient. But it is very much better to have the capsule and jet FIG. 141