Title
Heliograph, a visual telegraph
Caption
Heliograph, a visual telegraph for sending and receiving messages by means of mirrors and sunlight. Here a British signal unit in tropical kit are sending a message to the fort in the distance. Liebig trade card c.1900. Chromolithograph
Date
20th century
Credit line
Photo12/Ann Ronan Picture Library
Reference
ARP07102_390006041
License type
Rights managed
Available size
24,2Mb (1,9Mb) / 11,8in x 7,9in / 3543 x 2383 (300dpi)