'British heliographing from the Johannesburg Fort the news of the occupation', 1901 (c)

Stereoscopic photograph, Boer War, 1901 (c).

The soldiers are using Mance heliographs. These devices consisted of a small mirror mounted on a tripod and worked by reflecting sunlight in order to flash messages in Morse code.

From a box of 89 stereoscopic cards entitled, 'South African War through the Stereoscope Pt 2 Vol 1', published by Underwood and Underwood and produced by Works and Sun Sculpture Studios, 1901 (c).