alb9024928

Illustration showing a Mance Heliograph in British India.

Illustration showing a Mance Heliograph, a wireless solar telegraph that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. Henry Christopher Mance (1840-1926), of the British Government Persian Gulf Telegraph Department, developed the first widely accepted heliograph about 1869 in British India. 1880.

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Titre: Illustration showing a Mance Heliograph in British India.

Légende: Voir la traduction automatique
Illustration showing a Mance Heliograph, a wireless solar telegraph that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. Henry Christopher Mance (1840-1926), of the British Government Persian Gulf Telegraph Department, developed the first widely accepted heliograph about 1869 in British India. 1880

Crédit: Album / World History Archive

Autorisations: ? Autorisation de modèle: Non - ? Autorisation de propriété: Non
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Taille de l'image: 4591 × 4568 px | 60.0 MB

Taille d'impression: 38.9 × 38.7 cm | 1807.5 × 1798.4 in (300 dpi)