| 11. | Consequently, the coherer cannot be relied upon as a " calling-up apparatus ".
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| 12. | Unfortunately, the reduction in the coherer's electrical resistance persisted after the radio signal was removed.
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| 13. | This returned the coherer to the nonconductive state, turning off the electromagnet current, and the arm sprang back.
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| 14. | Popov constructed a filings coherer, one form of which was used in some surveying experiments by the Russian government.
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| 15. | Lodge used a detector called a " coherer ", a glass tube containing metal filings between two electrodes.
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| 16. | The receiver for the transatlantic demonstration employed a coherer, which had poor sensitivity and degraded the tuning of the receiver.
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| 17. | A coherer with electromagnet-operated " tapper " ( decoherer ), built by early radio researcher Emile Guarini around 1904.
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| 18. | However the usual range of coherer receivers even with the powerful transmitters of this era was limited to a few hundred miles.
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| 19. | The coherer became the basis for radio reception, and remained in widespread use for about ten years, until about 1907.
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| 20. | In 1894-95 he built his first radio receiver, an improved version of coherer-based design by Oliver Lodge.
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