Hugh Robjohns

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In the beginning The German physicist Johann Philipp Reis (1834–1874) is a strong candidate for the title. His design for a 'sound transmitter' (optimised around 1861), used a metallic strip resting on a membrane with a metal point contact completing an electrical circuit. It was Reis's theory that, as the membrane vibrated, the metal point bounced up and(More)
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