Word: diffracted
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Dates: during 1960-1969
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Remembering that radio waves diffract (bend) around obstructions, the IBM engineers calculated that they could twist their transmissions right over the top of mountains and other obstructions with out building repeater stations on top. They set up a weak, 15-watt transmitter 45 miles south of San Jose, Calif., on the other side of Loma Prieta, a 3,798-ft. peak in the Santa Cruz mountains. Then they pointed their transmitter's beam of 1,855-megacycle waves in the general direction of San Jose. When the beam was aimed too high, its waves shot off into space; when...
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