alb5414476
Johann Philipp Reis, Telephone,1860
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Titre:
Johann Philipp Reis, Telephone,1860
Légende:
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The Reis telephone was a rudimentary telephone invented by Johann Philipp Reis (German, 1834-1874). First built in 1860, it was based on the principle of magnetostriction. Wire coiled around iron cores and needles caused contraction when a current flowed, producing an audible click in a resonator. However, the sounds were faint, and there was little interest in the invention. The practical development of the telephone was achieved by others, such as Alexander Graham Bell.
Crédit:
Album / Science Source
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Taille de l'image:
3000 x 1924 px | 16.5 MB
Taille d'impression:
25.4 x 16.3 cm | 10.0 x 6.4 in (300 dpi)
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