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

Page scan 000274 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 #:
000274
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 259 in which the forks are inserted. The course of the incident pencil oa between the mirrors s { and s 2 will be seen from the diagram, any adjustment being easily made before tightening the screws, by either turning the perpendicular fork a little on its axis, or moving the horizontal one in its slot. Another block and slot k is provided for using both forks perpen- FiG. 135.—Mounting for Two Forks dicularly, the block k taking one out of the line of the other. It will be seen that with this arrangement both forks can be readily bowed by assistants, and will be firmly held. A very simple apparatus is shown in fig. 186, as made by Miller, of Innsbruck, from a design by Prof. Pfaundler. Two flat steel springs, P F, are mounted in a manner that needs no further explanation than the diagram, one being adjustable in position, and having a sliding weight. Both are furnished with mirrors. The springs may be bowefl, or are readily set in motion 82