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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Title: Illustration showing a Mance Heliograph in British India.

Caption: 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

Credit: Album / World History Archive

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Image size: 4591 × 4568 px | 60.0 MB

Print size: 38.9 × 38.7 cm | 1807.5 × 1798.4 in (300 dpi)

Keywords: ILLUSTRATION; MANCE HELIOGRAPH; WIRELESS; SOLAR; TELEGRAPH; SIGNALS; FLASHES; SUNLIGHT; MORSE CODE; REFLECTED; MIRROR; HENRY CHRISTOPHER MANCE; BRITISH; TELEGRAPH; HELIOGRAPH; 1869; BRITISH INDIA; 1880; COMMUNICATIONS; SIGNAL