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One hundred and ten years ago, two groups gathered to witness an experiment that those involved hoped would revolutionize how people communicated. The experiment was the official test of the Rev.

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of online ...

WE welcome this volume, which gives full practical details of the “Telef unken” or quenched-spark system of radiotelegraphy. (We use this word, fpr we think it will shortly receive international ...

METHODS of transmitting pictures by telegraphy have been known for the last ten years. In a suitably constructed photoelectric cell, the electric current through it can be made proportional to the ...

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