F. H. Richardson's bluebook of projection (1935)

Page scan 000690 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000690
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
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.

672 RICHARDSON'S BLUEBOOK OF PROJECTION Diopter Unit used by opticians to express refractive power of lenses. It is equal to the power of a lens having a focal length of one meter, or 39.39 inches. Direct Current (d.c.) — A current constant in flow in one direction but not necessarily constant as to voltage. Current that is constant both in voltage and direction of flow is known as continuous current. Diffusion As applies to projection, the reflection of light from a screen in such manner that its rays are scattered and no image is formed. Diffusion may be slight, or at very wide angles — so wide in fact that there is but a small difference in light distribution up to as much as fifty degrees. Double Exposure Two images photographically impressed upon a negative at separate times in such manner that both are partially visible when the resultant positive print is projected. Dowser In projection, a manually operated device by means of which the light may be cut off from the film and screen instantly. A metal blade that may be moved in front of the condenser at will of the projectionist. Efficiency Electrically, the proportion of input power that is utilized in useful work. The relation of input electric energy to the output applied usefully. Electrodes In arc lighting the electrodes are the carbons upon the ends of which the electric arc forms.