Results 171 to 180 of about 3,983 (207)
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Monde(s), 2019
A travers l'exemple du grand incendie de Chicago du 8 au 10 octobre 1871 et de la transmission d'informations par telegraphie en Grande-Bretagne et aux Etats-Unis, cet article etudie les dynamiques et les fausses evidences de la circulation de l ...
Simone M. Müller
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A travers l'exemple du grand incendie de Chicago du 8 au 10 octobre 1871 et de la transmission d'informations par telegraphie en Grande-Bretagne et aux Etats-Unis, cet article etudie les dynamiques et les fausses evidences de la circulation de l ...
Simone M. Müller
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1999
James Clerk Maxwell’s discovery of electromagnetic waves was proven experimentally by Heinrich Hertz. From then on here were numerous attempts to use electromagnetic waves for communications. A young Italian, Guglielmo Marconi, arrived in Britain and worked with the Post Office to gradually extend the radius within which radiation can be detected to ...
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James Clerk Maxwell’s discovery of electromagnetic waves was proven experimentally by Heinrich Hertz. From then on here were numerous attempts to use electromagnetic waves for communications. A young Italian, Guglielmo Marconi, arrived in Britain and worked with the Post Office to gradually extend the radius within which radiation can be detected to ...
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R.L. Edgeworth and optical telegraphy in Ireland, c. 1790–1805
Proceedings of the Royal Irish Academy: Archaeology, Culture, History, Literature, 2022A. Kirwan
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Industrial Archaeology Review, 2013
AbstractThis paper surveys the emergence of the era of electrical communications, from its beginnings in the 1830s through to the end of analogue technology. The electric telegraph soon became an essential and visible business tool with its network of poles and wires, but it is argued that, as each system was supplanted by the next, the evidence of its
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AbstractThis paper surveys the emergence of the era of electrical communications, from its beginnings in the 1830s through to the end of analogue technology. The electric telegraph soon became an essential and visible business tool with its network of poles and wires, but it is argued that, as each system was supplanted by the next, the evidence of its
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Transactions of the American Institute of Electrical Engineers, 1944
This paper on ``Telegraphy in the Bell System'' is a companion paper for the one prepared by the representatives of the Western Union Telegraph Company on ``American Telegraphy After 100 Years'' and the one by representatives of the International Telephone and Telegraph Company on ``Developments in the Field of Cable and Radiotelegraph Communications.''
J. A. Duncan, R. E. Pierce, R. D. Parker
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This paper on ``Telegraphy in the Bell System'' is a companion paper for the one prepared by the representatives of the Western Union Telegraph Company on ``American Telegraphy After 100 Years'' and the one by representatives of the International Telephone and Telegraph Company on ``Developments in the Field of Cable and Radiotelegraph Communications.''
J. A. Duncan, R. E. Pierce, R. D. Parker
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Electrical Engineering, 1947
Beyond the facts that they recur in welldefined cycles and that they affect certain of the earth's latitudes more than others, little but theoretical knowledge exists about the nature of sunspots and the sometimes concomitant magnetic storms. However, almost inadvertently, modern telegraph systems are being immunized against them by such innovations as
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Beyond the facts that they recur in welldefined cycles and that they affect certain of the earth's latitudes more than others, little but theoretical knowledge exists about the nature of sunspots and the sometimes concomitant magnetic storms. However, almost inadvertently, modern telegraph systems are being immunized against them by such innovations as
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Journal of the American Institute of Electrical Engineers, 1922
The history of the development of the subject is first outlined, and methods of operation of cables are described. The technical side is introduced with a statement of the various conditions whi h limit operation of cables, and a general method of analysis is developed, based upon an extension of ordinary alternating-current theory.
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The history of the development of the subject is first outlined, and methods of operation of cables are described. The technical side is introduced with a statement of the various conditions whi h limit operation of cables, and a general method of analysis is developed, based upon an extension of ordinary alternating-current theory.
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