Third Dimension Movies And E X P A N D E D Screen (1953)

Record Details:

Title:
Third Dimension Movies And E X P A N D E D Screen
Date:
1953
Publisher:
Cameron Publishing Company
Volume:
Third Dimension Movies And E X P A N D E D Screen
Leaf #:
000105
Language:
English
Collection:
Books
Format:
Books
Contributor:
Universal Digital Library
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.

102 THREE-DIMENSIONAL MOTION PICTURES angle. Since the approach of the arc to the condenser cannot be carried on indefinitely this led at once to larger condensers. It was possible to obtain a marked increase in angle with condensers of 6 inch diameter with aspheric surfaces, of course. A substantial in crease in illumination resulted. Some additional illumination, however, is possible by using an astigmatic condenser, one whose focal length in one meridian is shorter than its focal length in the other principal meridian. Such a condenser <^an be realized by employing one cylindrical surface, as we have done for years in aphthalmic instruments, or by employing a toric surface. A preliminary investigation subject to possible cor rection indicates a gain of something like 25 per cent obtainable in this manner. If now, the arc be run at something like 150 amperes with condensers as described a satisfactory illumination will be found possible. It still remains a question as to just what degree of illumi nation will be required. For the projection of these wide pictures, ordinary projection lenses are entirely out of question except in the longest focal lengths be cause of objectional curvature of field.