Results 1 to 10 of about 21,491 (303)
Journal of the Institution of Electrical Engineers, 1899 Maxwell\u27s theoretical deduction, as to the propagation of electric and magnetic energy by means of vibrations of the ether, was established experimentally by Hertz in 1887. This was a oulminative master stroke ending the two hundred years old problem,
Kelvin Reginald, A Fessel
core +6 more sources
Early innovations in maritime telemedical services: the KDKF Radio Medico Station [PDF]
Journal of the Medical Library Association, 2023 “MAN PUT HIS TONGUE AGAINST REFRIGERATOR PIPE AND GOT IT FROZEN; HAVE THAWED IT OUT AND IT IS NOW BLISTERED AND SWOLLEN BUT NOT PAINFUL. ARRIVING HONOLULU FRIDAY; HOW CAN I HELP HIM MEANWHILE?” Thus read a message relayed via radiogram across the ocean ...
Johnathan Thayer +1 more
doaj +2 more sources
A Historical Twist on Long-Range Wireless: Building a 103 km Multi-Hop Network Replicating Claude Chappe’s Telegraph [PDF]
Sensors, 2022 In 1794, French Engineer Claude Chappe coordinated the deployment of a network of dozens of optical semaphores. These formed “strings” that were hundreds of kilometers long, allowing for nationwide telegraphy.
Mina Rady +8 more
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Metasurface‐Assisted Wireless Communication with Physical Level Information Encryption [PDF]
Advanced Science, 2022 Since the discovery of wireless telegraphy in 1897, wireless communication via electromagnetic (EM) signals has become a standard solution to address increasing demand for information transfer in modern society.
Yilin Zheng +6 more
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Poincare's forgotten conferences on wireless telegraphy [PDF]
International Journal of Bifurcation and Chaos 22, 11 (2010) 3617, 2014 At the beginning of the twentieth century while Henri Poincar\'e (1854-1912) was already deeply involved in the developments of wireless telegraphy, he was invited, in 1908, to give a series of lectures at the \'Ecole Sup\'erieure des Postes et T\'el\'egraphes (today Sup'T\'elecom). In the last part of his presentation he established that the necessary
J. Ginoux, Loïc Petitgirard
arxiv +3 more sources
The Daniell Cell, Ohm's Law and the Emergence of the International System of Units [PDF]
Amer. J. Phys. 82 (2014) 60, 2015 Telegraphy originated in the 1830s and 40s and flourished in the following decades, but with a patchwork of electrical standards. Electromotive force was for the most part measured in units of the predominant Daniell cell. Each company had their own resistance standard.
Jayson, Joel S.
arxiv +3 more sources
Media and Communication, 2018 This article examines the privatization of telegraphy in the British Empire from the perspective of Gibraltar, an overseas territory in the Mediterranean. While the history of international telegraphy is typically written from a world-systems perspective,
Bryce Peake
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Wireless Telegraphy at the German Universal Exhibition in Ústí nad Labem in 1903 [1] [PDF]
Acta Polytechnica, 2008 This paper focuses on the transmission of wireless telegraphy between Ústí nad Labem and Teplice during the German Universal Exhibition in Ústí nad Labem in 1903.
T. Okurka
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The singing arc: the oldest memristor? [PDF]
, 2014 On April 30th 2008, the journal Nature announced that the missing circuit element, postulated thirty-seven years before by Professor Leon O. Chua has been found. Thus, after the capacitor, the resistor and the inductor, the existence of a fourth fundamental element of electronic circuits called "memristor" was established.
Ginoux, Jean-Marc, Rossetto, Bruno
arxiv +5 more sources
A tale of two telegraphs: Cooke and Wheatstone’s differing visions of electric telegraphy
Science Museum Group Journal, 2017 This paper explores the early development of practical electric telegraphy in Britain during the nineteenth century. It exposes the two fundamentally different approaches to the design of telegraphic instruments specified in a joint patent between ...
Jean-François Fava-Verde
doaj +2 more sources