F. H. Richardson's bluebook of projection (1942)

Page scan 000110 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000110
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:
July 11, 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.

94 RICHARDSON'S BLUEBOOK OF PROJECTION the anode is not an emitter (except to a slight extent when bombarded by electrons). If an alternating potential be connected to the B circuit of Figs. 40 and 41 current will flow according to Ohm's Law while the anode is positive but the B circuit will be open inside the tube whenever the anode becomes negative. Such tubes, both vacuum and gas-filled, are used in the projection room for the purpose of obtaining d.c. from an a.c. supply. They are said to "rectify" the a.c. — that is, convert it to d.c. — and are called rectifying tubes or more simply, rectifiers. (95) Many vacuum tubes essentially the same as those diagramed in Figs. 40 and 41 are given the modified structure shown in Fig. 42. The additional element introduced between the cathode and the plate is called a grid. It consists either of metal mesh or a spiral of wire surrounding the cathode. Electrons passing from cathode to anode must move between the turns or through the meshes of the grid, and are greatly influenced by any PLATE OPCU/T gp/p c/pca/r Figure 42 charge that may be placed on the grid. The grid is located at that point between cathode and anode where electrons emitted with only moderate velocity can be made