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The technical problems of colour television have been solved long ago - a German patent for the transmission of images in colour was taken out by the physicist, Otto von Bronk, as far back as 1902 - but the high cost of the equipment, especially receivers, has held up its general introduction. In America, television programmes in colour have been transmitted since the early 1950’s to a limited number of viewers who can afford the extra cost, and an experimental service began in Britain in 1955. Japan started its regular colour service in the autumn of 1960: a year later there were already 15,000 receiving sets in operation, although the price of a colour set was still eight times as much as that of a black-and-white receiver. Then the Soviet Union, too, has introduced a colour television service.