On the eve of a great battle, nd.

On the eve of a great battle, squadron of aircraft reconnoitre, map and direct the artillery fire, nd. From a collection of ninety-six stereoscopic photographs in box two of two entitled ‘The Great War’ including the official series. With stereoscopic viewer. Stereographs consist of two identical photographs paired in such a way that when seen through a special viewing instrument, a stereoscope, they appear as a three-dimensional images. By 1899 the photographs were mounted on thick card that was given a slight curvature to increase the illusion of depth. Associated with World War One, Western Front (1914-1918).