WW1 Official British Press Photograph Signalling Back to Support Line

WW1 Official British Press Photograph Signalling Back to the Support Line
This clear interesting photograph shows two Royal Engineers using a visual signalling machine. It is interesting to note amongst the equipment is one of the soldiers set of 1914 leather equipment.
 The reverse with the original caption. Also with cyrillic text. GC This is an original period photograph 8 1/2 x 6 1/2 inches.