File:EB1922 Telephone - Telephone repeater circuit.jpg
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
EB1922_Telephone_-_Telephone_repeater_circuit.jpg (781 × 466 pixels, file size: 64 KB, MIME type: image/jpeg)
File information
Structured data
Captions
Captions
Add a one-line explanation of what this file represents
Summary
[edit]DescriptionEB1922 Telephone - Telephone repeater circuit.jpg |
English: A modern telephone repeater for insertion at an intermediate point in a long telephone line consists essentially of two thermionic tube amplifiers, one for the up and one for the down side of the line circuit, associated with apparatus for balancing the line circuits for duplex working, the telephone circuit being necessarily a duplex circuit. The general arrangement is shown in the figure. |
||||
Date | published 1922 | ||||
Source | “Telephone,” Encyclopædia Britannica (12th ed.), v. 32, 1922, p. 709, fig. 6. | ||||
Author | William Noble | ||||
Permission (Reusing this file) |
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 22:22, 13 January 2020 | ![]() | 781 × 466 (64 KB) | Bob Burkhardt (talk | contribs) | {{Information |description ={{en|1=A modern telephone repeater for insertion at an intermediate point in a long telephone line consists essentially of two thermionic tube amplifiers, one for the up and one for the down side of the line circuit, associated with apparatus for balancing the line circuits for duplex working, the telephone circuit being necessarily a duplex circuit. The general arrangement is shown in the figure.}} |date =published 1922 |source =“Telephone,” ''En... |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikisource.org