Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000123
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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.

MANAGERS AND PROJECTIONISTS 1047 RECTIFIER TUBES.— Where a portion of the amplifier power comes from rectified A. C. it is, of course, essential that the rectifier tubes be in good condition. What has been said concerning the care of amplifier tubes applies equally to rectifier tubes. The filament current value must not exceed that specified in your operating instruction book, nor should it be less than that value. When tubes begin to give indication of deterioration, they should be promptly replaced. In Western Electric installations two rectifier tubes will be found. This is to enable the using of both halves of the A. C. wave. IMPORTANT CAUTION.— The amplifier tubes and photo-electric cell at the motion picture projector in Western Electric installations are suspended in a spring cradle. This is for the purpose of absorbing the vibrations of the projector mechanism. It is very important to see to it that this cradle swings free of everything. Should it touch any part of the projector, mechanical vibrations will be picked up and carried forward and heard in the horns. AMPLIFICATION DIAL SWITCH.— The amount of amplification produced in Western Electric installations is controlled by means of the dial switch of the first amplifier of the set on the rack. This switch will be set by the installation engineers, and that setting should not be altered except upon instructions issued by, or with the approval of the service engineer. FILAMENTS IN SERIES.— In some instances two or more tubes are operated with their filaments in series. In such cases the failure of a filament in one of the tubes will of course extinguish all the tubes. You must