This file is from a shared repository and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionGlow discharge structure - English.svg
English: Diagram of the structure of a glow discharge, showing the names of the different glowing regions in the gas and graphs showing how the potential (V), electric field (E), charge density (n), and current density vary along the tube. The current density graph shows current due to electrons (j−) and positive ions (j+) separately. Similarly the charge density graph shows the density of the electrons (n−) and ions (n+) on opposite sides of the axis. VC and VA are, repectively, the "cathode fall" and "anode fall", the voltage drop at the electrodes.
Русский: Структура тлеющего разряда с различными светящимися областями в газе и графики, показывающие, как потенциал () электрического поля (), плотность заряда () и плотность тока изменяются вдоль разрядной трубки. На графике плотности тока отдельно показан ток, обусловленный электронами () и положительными ионами (). График плотности заряда показывает плотность электронов () и ионов () вдоль трубки. и – соответственно "катодное падение" и "анодное падение" – падение напряжения на электродах.
Date
Source
Derivative: Own work
Original: from L. B. Loeb, Fundamental Processes in Electrical Discharges in Gases, 1939, New York: John Wiley, fig 269, p 566.
The Loeb book would have the copyright renewed in 1967. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found at The Online Book Page. Search of the Renewals for Periodicals for 1966, 1967, and 1968 show no renewal entries for Loeb's book. Therefore the work's copyright was not renewed and it is in the public domain.
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.