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Photograph of the Turkish army heliograph at Huj
ARP18A25_279

Photograph of the Turkish army heliograph at Huj

The Kew heliograph
ARP15A00_423

The Kew heliograph

British marines practicing sending and receiving signals by heliograph
ARP11A00_002

British marines practicing sending and receiving s...

Heliograph, a visual telegraph
ARP07102_390006041

Heliograph, a visual telegraph