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 #:
000138
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 187 Cleaning and Assembling First note whether the extension tube is attached to the front or rear end so you will replace it correctly. Clean both sides of the front combination but do not remove it from the cell. To remove the retaining ring from the rear cell, press lightly on opposite sides of the ring with two fingers and unscrew it. Too much pressure will make it bind so it will not turn. Clean inside surfaces of the two lenses of the rear combination and replace in the cell. Be careful they are seated evenly, then screw up the retaining ring just tight enough to prevent them from moving, then clean the outside surface. The rear lens is convex on both sides and the flatter side is the outside rear surface. The retaining rings should face towards the centre; reversing the cells will disturb the correction. To remove grease or oil from the surface of the lens use a soft rag free from grit, moistened with a little gasoline. Be careful when screwing the parts together to avoid skipping a thread and do not screw up any joints very tight. Do not use a hard sharp tool to remove the retaining rings or it may slip and scratch the lenses.