Fichier:Brockhaus-Efron Oscillation 2.jpg

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Description
Русский: Иллюстрация к статье Электрические колебания из энциклопедии Брокгауза и Ефрона
English: Micrometer spark gap detector used by German physicist Heinrich Hertz in his historic 1889 experiments in which he demonstrated the existence of radio waves. It consisted of a loop antenna consisting of a loop of wire with a spark gap that could be finely adjusted with a thumbscrew. With this he detected radio waves in the UHF range from a spark gap transmitter. From article "Electric Oscillations" in Brockhaus and Efron encyclopedia.
Date vers 1905
date QS:P,+1905-00-00T00:00:00Z/9,P1480,Q5727902
Source http://dic.academic.ru/dic.nsf/brokgauz_efron/146322
Auteur Брокгауз и Ефрон
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Public domain
Cette image vient du Dictionnaire encyclopédique Brockhaus et Efron (1890-1907). Le droit d'auteur pour ce livre a expiré et cette image est dans le domaine public.

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Public domain
This work was published on territory of the Russian Empire (Russian Republic) except for territories of the Grand Duchy of Finland and Congress Poland before 7 November 1917 and wasn't re-published for 30 days following initial publications on the territory of Soviet Russia or any other countries.

The Russian Federation (early Soviet Russia, RSFSR) is the historical heir but not legal successor of the Russian Empire, and the Russian Empire was not party to the Berne Convention (it was not country of Union for the protection of the rights of authors in their literary and artistic works), so according to article 5 of the Convention this work has no country of origin except:

  • in the case of cinematographic work the maker of which has his headquarters or his habitual residence in a country of the Union, the country of origin shall be that country,
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Cette œuvre est dans le domaine public aux États-Unis car elle a été publiée avant le 1er janvier 1929.

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[[Category:Spark-gap transmitters}

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actuel23 juin 2009 à 23:27Vignette pour la version du 23 juin 2009 à 23:27216 × 220 (15 kio)Lozman{{Information |Description={{ru|Иллюстрация к статье ''Электрические колебания'' из энциклопедии Брокгауза и Ефрона}} |Source=http://dic.academic.ru/dic.nsf/brokgauz_efron/146322 |Date=

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