For several decades the de Forest vacuum tube was the standard electronic amplifying device. Now the transistor, a tiny, rugged amplifying device conceived in the Bell Laboratories, is in a number of cases replacing vacuum tubes in radio sets, hearing-aids, telephone switching-systems, computers, bomb-sights and a variety of other electronic devices. The transistor, being only a small piece of crystal, is much less bulky than the vacuum tube; it does not require heating and so economises power and avoids the generation of unwanted heat. Although still in its infancy, it has already made its mark as a valuable creation.
KeywordsTungsten Carbide Tungsten Wire Vacuum Tube Bell Laboratory Bell Telephone Laboratory
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