Corporal Joseph Egerton in gas mask, 1917 (c).

Corporal Joseph Egerton of the Shropshire Yeomanry in gas mask, 1917 (c). Egerton wears a small box filter respirator, a gas mask that was introduced in 1916. This design had a mask connected by a hose to a tin can containing gas absorbent materials. It was an improvement on the earlier gas hoods and gave better protection against the different gases in use. Gas first was used in the Middle Eastern theatre by the British in April 1917 during the Second Battle of Gaza. Associated with Cpl Joseph Egerton, Shropshire Yeomanry, World War One, Egypt and Palestine (1914-1918), 1916-1918.