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Wireless World Golden Jubilee review of 1952

Wireless World April, 1961.
    
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Some of the exhibits at the Physical Society's annual exhibition showed how widely electronic techniques had now been adopted for 'run-of-the-mill' industrial processes, as opposed to their original laboratory uses. In the textile industry it was being used for measuring the tension of yarn and for showing irregularities in its weight per unit length. Supersonic waves were being used as a matter of routine for the detection of flaws and for determining thicknesses with high accuracy. Perhaps the most important of all was the growing use of electronic controls in the chemical industry.

Detailed information came from the US Bureau of Standards on 'a new kind of VHF propagation', later to be known as 'ionospheric scatter'. Weak but consistent signals on a frequency of 50MHz had been received over a period of many months at a distance of 774 miles. The power used was 23kW, the signals being radiated from a high-gain aerial set at an elevation angle of seven degrees.

BBC equipment for converting the French 819-line pictures to the British standard
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