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

Page scan 000108 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 #:
000108
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
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92 RICHARDSON'S BLVEBOOK OF PROJECTION (91) Conduction through a vacuum has not yet been described. If there be no gas in the envelopes of Figs. 40 and 41, but if emission of electrons from the cathode i + . E> circuit . A circuit Figure 41 takes place, those electrons will be attracted by the positively charged anode. A vacuum contains nothing, hence cannot hinder the electrons from being pulled to the anode. The resistance of a perfect vacuum is zero. The number of electrons arriving at the anode in a vacuum structure like Figs. 40 and 41 will be governed in part by the "emission resistance." That is to say, it will depend upon the number of electrons emitted, and other factors explained below. The total effect of all factors tending to limit the number of electrons reaching the anode is known as the anode impedance or plate impedance (the anode being sometimes called the plate). This is equal (Ohm's Law) to E/I, where E is the voltage difference between anode and cathode and I is the vacuum current. (92) In a vacuum tube of the type diagramed, the plate impedance includes the following influences: (a) The extent of emission from the cathode, (b) The fact that the cathode, having emitted electrons is left relatively positive by their absence. It is still negative as compared