3.7 inch Light Trench Mortar in action on the Salonika Front, 1915 (c)

Lantern slide, World War One, Salonika (1914-1918), 1915 (c).

The 3.7 inch was one of the earliest trench mortars used by the British. It was fired by a length of fuze. The firer would then quickly take cover as the device was unreliable owing to the barrel often bursting. From mid-1916 it was gradually replaced by the superior 3-inch Stokes Mortar.

From a box of 50 lantern slides.