3480017 Varley\'s improved form of vacuum lightning protector for telegraphs, 1882; (add.info.: Varley\'s improved form of vacuum lightning protector for telegraphs. Shown at the International Electric Exhibition at the Crystal Palace, 1882.); Universal History Archive/UIG; out of copyright.
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TOP27536724
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達志影像
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RM
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須由TPG 完整授權
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19thcentury19centuryXIXcenturyXIXthcenturycommunicationcommunicationsGreatBritainbritishBritainGBunitedkingdomUKEuropeeuropeantelegraphtelegraphyelectrictelegraphvarleysvacuumtubelightningprotectorelectricexhibitionvarleysvacuumtube1880stelegraphycrystalpalacelightningprotectorelectrictelegraph19thcenturyunitedkingdomelectricexhibitioncommunication1880stelegraphycrystalpalacelightningprotectorelectrictelegraph19thcenturyunitedkingdomelectricexhibitioncommunication
1880s1880s1919th19th19thBritainBritainEuropeGBGreatUKXIXXIXthbritishcenturycenturycenturycenturycenturycenturycommunicationcommunicationcommunicationcommunicationscrystalcrystalelectricelectricelectricelectricelectricelectriceuropeanexhibitionexhibitionexhibitionkingdomkingdomkingdomlightninglightninglightningpalacepalaceprotectorprotectorprotectortelegraphtelegraphtelegraphtelegraphtelegraphytelegraphytelegraphytubetubeunitedunitedunitedvacuumvacuumvarleysvarleys