Motion picture projection; an elementary text-book (1921)

Record Details:

Title:
Motion picture projection; an elementary text-book
Date:
1921
Publisher:
New York, Theatre Supply Co.
Volume:
Motion picture projection; an elementary text-book
Leaf #:
000126
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
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.

MOTION PICTURE PROJECTION 125 Objective Lens. The objective lens of a moving picture machine generally consists of four lenses, two in the front combination and two in the rear. The two lenses in the front are cemented together with Canada Balsam and called the compound lens. The back combination consists of two lenses separated by a metal ring, called the duplex lens. The convex or greatest convex side of a lens always faces the screen. It is absolutely necessary to keep the lenses clean, it will be impossible to get good definition or sharp focus on the screen if the objective lens is not scrupulously clean. Never place the fingers on the glass Fig.l Fig.2 Fig.4 Figures 1 and 2 the crater of arc needs adjusting laterally to right or left Figures 3 and 4 the crater too high or too low Figures 5, 6 and 7 the crater is too near or too far away from condenser Figure 8 shows arc in correct position