240 mm Trench Mortar
An illustration of a 240 mm Trench Mortar used by the French during World War I, and designed by Dumezil—Batignolles. The mortar had a short barrel firing 192 lb. bombs.
Encyclopaedia Britannica (12th ed., vol. 32) (New York, NY: The Encyclopaedia Britannica Company, 1922)
Courtesy the private collection of Roy Winkelman