DocumentCode
3319682
Title
Amplifiers before electronics — the Magnifiers
Author
Moyle, John
Author_Institution
Telegraph Museum, Porthcurno
fYear
2008
fDate
11-12 Sept. 2008
Firstpage
136
Lastpage
141
Abstract
Amazing ingenuity was shown by dasiaelectricianspsila prior to the development of the thermionic valve (tube) into a reliable means of amplification of extremely low current signals in the earliest telecommunication systems. This paper classifies the devices used and then describes the principles involved in the group known as magnifiers. Super-sensitive galvanometers preceded signal amplification; the mirror galvanometer and the siphon recorder are therefore also described.
Keywords
amplification; galvanometers; history; thermionic tubes; amplifiers; low current signals; magnifier; mirror galvanometer; signal amplification; siphon recorder; supersensitive galvanometers; telecommunication systems; thermionic valve; Coils; Digital relays; Electron tubes; Fires; Kelvin; Mirrors; Telegraphy; Underwater cables; Valves; Wire; Heurtley; Horton Flame; Lord Kelvin; Magnifiers; Orling; SG Brown; Siphon recorder;
fLanguage
English
Publisher
ieee
Conference_Titel
History of Telecommunications Conference, 2008. HISTELCON 2008. IEEE
Conference_Location
Paris
Print_ISBN
978-1-4244-2530-3
Electronic_ISBN
978-1-4244-2531-0
Type
conf
DOI
10.1109/HISTELCON.2008.4668729
Filename
4668729
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