Grabenmörser The Erdmörser or "buried mortar" is made of a wooden cylinder reinforced with wire. The inside diameter is 25 cm. The mortar is buried in the bottom of the trench and the projectile slides along a wooden racer 2 m. 40 (7 feet 10 inches) in length, semi-circular in cross section and resting on the parapet with an inclination of 45°.
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