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2019-11-06 08:56:40
HERTZ, Heinrich Rudolf.
Ueber sehr schnelle electrische schwingungen. Offprint from Annalen der Physik, Bd. 31 (1887). With six other offprints documenting Hertz's seminal work which demonstrated the existence of electromagnetic waves, which thereby provided the experimental proof of Maxwell's theory and formed the foundation for wireless communication.
Leipzig; Berlin: Johann Ambrosius Barth; George Reimer for the Königlich Akademie der Wissenschaften, 1887-1892. First edition. First edition, extremely rare offprint, of the first of Hertz's papers on electromagnetic waves, accompanied by offprints of six further papers on the same subject, including 'Ueber elektrodynamische Wellen im Luftraume und deren Reflexion', in which Hertz first demonstrated the existence of electromagnetic waves propagating in air ('Hertzian waves'). "In his Treatise on Electricity and Magnetism (1873) [Maxwell] gave no theory of oscillatory circuits or of the connection between currents and electromagnetic waves. The possibility of producing electromagnetic waves in air was inherent in his theory, but it was by no means obvious and was nowhere spelled out. Hertz's proof of such waves was in part owing to his theoretical penetration into Maxwell's thought" (DSB). "Experimental proof by Hertz of the Faraday-Maxwell hypothesis that electrical waves can be projected through space was begun in 1887, eight years after Maxwell's death. The two main requirements were (a) a method of producing the waves, supposing that they existed, and (b) a method of detecting them once they were produced. Hertz found the first problem easy to solve. He used the oscillatory discharge of a condenser. Detection was much more difficult, because there then existed no means of detecting currents alternating at the high speed of these waves. Hertz in fact used an effect as old as the discovery of electricity itself - the electric spark. By inducing the waves to produce an ele … [Click Below for Full Description]
Bookseller: SOPHIA RARE BOOKS [Denmark]

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