THE FRENCH ARMY ON THE WESTERN FRONT, 1914-1918 (Q 61057) The French Tissot mask demonstrated by a French soldier. The Tissot mask was revolutionary in that it gave the wearer greater visibilty by allowing air to pass over the eye-pieces. Arras, 12 July 1918. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205194055