Période

17 résultats pour : radio waves

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Priest broadcasting a religious message to millions on a Marconi short-wave radio from the Vatican City
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Priest broadcasting a religious message to million...

Photograph of Guglielmo Marconi's wireless telegraph station in Cornwall, which sent and received signals between England and America
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Photograph of Guglielmo Marconi's wireless telegra...

Marconi'S wireless telegraph being used to report international yacht races
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Marconi'S wireless telegraph being used to report ...

Heinrich Hertz's oscillator and reflecting metal sheets to show outward and return paths of electromagnetic
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Heinrich Hertz's oscillator and reflecting metal s...

Photograph showing one of the world's smallest water-cooled valves, being compared with a large one
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Photograph showing one of the world's smallest wat...

Photograph of the exterior of Broadcasting House, London, which at the time symbolised the practical progressiveness and modernity of the B
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Photograph of the exterior of Broadcasting House, ...

Photograph of Guglielmo Marconi's cabin aboard the SS Minneapolis filled with his equipment
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Photograph of Guglielmo Marconi's cabin aboard the...

Photograph of a woman sat listening to a radio broadcaSt Dated 20th century
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Photograph of a woman sat listening to a radio bro...

Photograph of the mobile radio station used by Guglielmo Marconi
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Photograph of the mobile radio station used by Gug...

Heinrich Hertz's oscillator and reflecting metal sheets to show outward and return paths of electromagnetic
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Heinrich Hertz's oscillator and reflecting metal s...

Guglielmo Marconi's wireless telegraph station in Dresden, which received signals from Oberschöneweide and transmitted them to Karskrona in Sweden and Poldhu in Cornwall
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Guglielmo Marconi's wireless telegraph station in ...

Heinrich Hertz's oscillator and reflecting metal sheets to show outward and return paths of electromagnetic
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Heinrich Hertz's oscillator and reflecting metal s...

A wireless telegraph operator on a ship
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A wireless telegraph operator on a ship

Illustration explaining the operation of wireless telegraphy at sea
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Illustration explaining the operation of wireless ...

large German exhibition
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large German exhibition

Joseph Lushene operating long-wave radio receiver
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Joseph Lushene operating long-wave radio receiver

Marconi radio station at Berne, Long wave
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Marconi radio station at Berne, Long wave