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TELEGRAPHONE: magnetic recording tele phone invented by Valdemar Poulsen (1869-1942).

TELEGRAPHONE: magnetic recording tele phone invented by Valdemar Poulsen (1869-1942). He applied for a patent on 1 December 1898; and the instrument aroused great interest at the Paris Exposition of 1900. RIBBON TELEGRAPHONE: detail of thin steel ribbon mounted on pulleys.
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Titre:
TELEGRAPHONE: magnetic recording tele phone invented by Valdemar Poulsen (1869-1942).
Légende: Voir la traduction automatique
TELEGRAPHONE: magnetic recording tele phone invented by Valdemar Poulsen (1869-1942). He applied for a patent on 1 December 1898; and the instrument aroused great interest at the Paris Exposition of 1900. RIBBON TELEGRAPHONE: detail of thin steel ribbon mounted on pulleys.
Crédit:
Album / World History Archive
Autorisations:
Modèle: Non - Propriété: Non
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Taille de l'image:
11114 x 5661 px | 180.0 MB
Taille d'impression:
94.1 x 47.9 cm | 37.0 x 18.9 in (300 dpi)