Richardson's handbook of projection (1927)

Page scan 000371 from Richardson's handbook of projection

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000371
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 819 Figure 309A You will observe that with the light source (We have merely used a point light source for illustration, disregarding the actual practical effect diameter the light source has, because it does not in any way alter the principle we seek to make clear) located three inches from the face of a collector lens having a free opening of 4% inches, approximately a 70 degree angle of light is collected and transmitted forward to the converging lens. This angle diminishes rapidly, however, as the light source is retarded, as shown in figure 309A, and when it, the light source, is 4.5 inches from the face of the lens, only an angle of 50 degrees enters the lens and is transmitted forward to the converging lens. In this connection, however, it must be noted that as the light source is retarded — moved away from the lens — the angle of incidence of the light rays with the lace of the lens becomes less, and the loss by reflection is therefore reduced. This latter, however, amounts to comparatively little, except in cases where the light source is verv close to the collector lens.