Bell telephone magazine (1922) (14754076704)

Identifier: belltelephone7273mag00amerrich (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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thematician, con-firmed in experiment and is now tobe put into practice. The waveguidestory consists of what Mr. deButtscalled hundreds and thousands ofpatiently achieved advances, mostof them unheralded. Transistor technology essential One, however, although not her-alded loudly at its advent, has longsince been identified as one of thegreat scientific breakthroughs of alltime and the progenitor of wholenew industries. From the earliestdays of radio, the vacuum tube wasthe vital heart of oscillators thatgenerated radio waves. But, duringthe 1930s, forward-looking engi-neers realized that the electron tubehad been perfected almost to its nat-ural limits. Highly refined as it hadbecome, it was wasteful of power,generated heat, was expensive tomake, was fragile and failure-prone.After World War II ended. Bell Lab-oratories scientists revitalized re-search that had been carried on spo-radically years before but that nowbecame the subject of organized in-vestigation: the study of semicon-

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1922

Prelinger Library

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