File:Bell telephone magazine (1922) (14753735904).jpg

Identifier: belltelephonevol3132mag00amerrich (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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new ume of 12 million miles of wire in to science but Is relatively new to In- cable in one year. With experienceIn Its design, manufacture, and use,it is proving to have other advan-tages In many cases because of lightweight and freedom from corrosion.■ A quite different type of materialfundamental to modern telephonesystems Is those ferrousallovs used to carry themagnetic field in myr-iad types of equipment.Iron was formerly usedfor this purpose. TheBell Telephone Labo-ratories over the yearshave developed new al-loys of iron, nickel,and. In smaller quanti-ties, molybdenum andother metals, whichhave extraordinarilyImproved magneticproperties. The bulk ofcertain types of loadingcoil, for example, hasbeen reduced by 20 toI for the same use. dustry. In Its present form. It con-sists of a tiny piece of this metalwhich has first been purified to anextremely high degree and then sub-jected to the introduction of care-fully controlled impurities of differ-ent types and amounts. The tiny
Text Appearing After Image:
The tiny plastic bead of the transistor contrasts with thefamed peanut (6AK^) vacuum tube 64 Bell Telephone Magazine SUMMER piece enclosed in the plastic beadshown in the photograph has threesections, containing different types ofimpurity, and a wire connected toeach of the three sections. This re-markable midget, connected with suit-able circuits and modest sources ofpower, will amplify, modulate, orgenerate with extraordinary efficiencyand economy the electrical currentsrequired for communication. It seemsdestined to revolutionize a good dealof the construction and design ofelectronic devices. New Systems of Communication The processes of invention anddevelopment weld many of the newdevices, along with many pieces ofapparatus and devices previouslyavailable, into new methods andsystems for giving communicationservice. The influence of these newcommunication systems on the de-velopment of telephone service ismarked. One of the striking modern devel-opments is the great extension ofmu

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