Abstract
The article details the creation of the first telephone relay devices at WECo for the future extra-long telephone line New York – San Francisco. The main attention in the article is focused on the development of these devices by an employee of the company Harold Arnold based on mercury gas discharge technologies. An analysis of the designs of repeaters that existed before 1911 is given. The substantiation of the chosen scientific direction for the development of repeaters in WECo is given. The designs of Peter Cooper Hewitt mercury discharge lamps and John Bellamy Taylor’s mercury arc relay are considered. It was noted that the organization of a research group at WECo to develop repeaters based on new physical principles and the invitation of young talented scientists to this group made it possible to obtain a significant scientific result.
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