Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000513
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
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.

(25 -GRAMS CONSTANT FORCE ) 021 400,000 800,000 1,200,000 1,600,00 FEET OF FILM Fig. 3. Effect of wear on area of pole pieces in contact with film. SOUND DRUM SURFACE AFTER 777 HOURS BEFORE LiFE TEST Wj LIFE TEST (1,680,000 FEET OF FILM) Fig. 4. Change of contour due to wear (25 grams constant force). the curve shows relatively constant wear with respect to the amount of film passing through the projector. The change in pole-piece area is shown in Fig. 3. This also shows the most rapid change during the first part of the test and very little change thereafter. Figure 4 shows the wear of a head use in the tests. The dotted line represen the periphery of the sound drum. The tests were not carried to destru< tion because it was thought advisable t retain the full performance of the hea \ after running what was considered com mercially satisfactory film footage. 504 April 1953 Journal of the SMPTE Vol. 60