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
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Details
Creative#:
TOP09099788
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
NO
Property Release:
NO
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No
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