Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Date:
1914
Author:
Gage, Simon Henry, 1851-1944
Publisher:
Ithaca, N.Y. : Comstock Publishing Company
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Leaf #:
00056
Language:
English
Subjects:
Lantern projection, Motion picture projection
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

CH. I] CENTERING THE MAGIC LANTERN FIG. 1 8. FIGURE SHOWING HOW TO FIND THE CENTER OF A CIRCLE. Draw two chords (ch ch) and erect perpendiculars at their middle points. Where these perpendiculars cross is the center of the circle (C). As stated above, when once centered, the objective and condenser should be fixed in position. § 54. Avoidance of obliquity. — Not only must all the parts be at the same level and in one straight line, but the lenses must be perpendicular to that straight line and not oblique. Then the straight line or common axis passing from the crater of the upper carbon to the screen will coincide with the principal axis of the condenser and the projection objective, and the arrangement for perfect projection will be realized (fig. 1-4, 26). One can usually tell when the parts are in line and not oblique by sighting along them with the eye, or by the use of a straight edge like a T-square. To make sure by measurement one can put the optical bench or base-board (fig. 158, 1 59), on a level table and next a smooth wall. Then by measuring horizontally the central points can be determined exactly as their height was determined (§52). CORRECT DISTANCE APART OF THE DIFFERENT ELEMENTS § 55. Radiant and condenser. — With the three-lens condenser the radiant is at the right distance when it is at the principal focus of the first element of the condenser (fig. 2). This will give a