Word: 5x3
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Dates: during 1920-1920
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...listen to it and the sounders in New York will not disturb anyone in the Union. However, the sending operator must have a sounder in order to know what he is sending and whether all points are getting it. Accordingly, the usual sounder, which is an instrument about 5x3 inches in size, is replaced by a miniature sounder not bigger than a cubic inch. This is placed with an earpiece which rests over the sending operator's ear like a telephone head receiver. The operator thus hears the click of his instrument which is inaudible to others...
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