File:Bell telephone magazine (1922) (14569322830).jpg

Identifier: belltelephonemag4344amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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icrowave site on Buckhorn Mountain, Colone of Bell Systems highest. Below: ibreakers are assembled to protect wave guiequipment on a mountain top microwave tow
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Although the electron tubes used on the TD-2 system are remarkable in de-sign and compactness, their power output is limited. A more modern tube capable of greater power output has been developed and this is utilized with the THand TD-3 systems. Called the traveling wave tube, it operates on a principle quite different from that of the conventional electron tube. In the traveling wave tube the signal passes through a spiral conductor in the presence of a strong electron stream. Energy from this stream combines with the signal to increase its amplitude, much as the wind blowing over the surface of the sea increases the size of the waves. Periodic inspection ensures that the equipment at each station is operating at peak efficiency. But should maintenance or restoration work be called for unexpectedly at locations that are unattended, an ingenious alarm system gives instant notice of the nature of any difficulty to a control office where telephone people are ready to take the necessary action. This may

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