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 #:
00069
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:
March 28, 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 993 RCA Photophone Recording jyCA PHOTOPHONE, INC., records sound upon -*^ standard thirty-five (35) millimeter wide film, the actual sound record, or "sound track," occupying a space of .070 of an inch wide. The sound track is located upon the right-hand side of the film as it is threaded into the motion picture projector and its sound attachment. What is known technically as the "variable area" method of recording is employed. The record consists of a series of more or less sharply angled and more or less wide opaque peaks, the same extending across or partly across the width of the sound track, their bases next the sprocket holes. Between each pair of opaque peaks there is, of course, a transparent peak, the base of which lies in the opposite direction. This is clearly shown in Fig. 385, which is a photograph of the sound track, many times enlarged. The edges of the "peaks" represent the vibration of the microphone diaphragm, hence the sound waves which set the diaphragm into motion, but in the reproduction the sound is really the result of the variations in light intensity set up by the passage of the line of light from the slit through the transparent "peaks" in the sound track. It is a very difficult matter to put an intelligent explanation of the effect of this sound track upon the light beam into words, but I will try. Examining Fig. 385, it is not difficult to understand that if a thin line of light 3