Science: Long-Jump Beam

The highly serviceable microwave, used for faithful transmission of television or multi-channel telephone service, has always had one shortcoming: in long distance use it cannot follow the curve of the earth, must be relayed in short jumps from stations placed about 30 miles apart. This week the Bell Telephone Laboratories and M.I.T. disclosed that their scientists, working together, have devised a new system to overcome this distance limitation of microwave beams.

Instead of transmitting on direct line-of-sight, the Bell-M.I.T. method shoots a beam into the sky like a giant searchlight. A searchlight beam passing through the air is visible many miles away...

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