He designed the Röchling Shell that was tested in 1942 and 1943 against the Belgian Fort d'Aubin-Neufchâteau and the V-3 cannon.
James Richard Haskell was an American inventor chiefly remembered for his invention (with Azel S. Lyman) of a multi-charge gun which was intended to increase muzzle velocity by detonating additional propellant charges behind the projectile or shell as it moved up the gun's barrel and was a distant ancestor of the World War II German V-3 "supergun".
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It was used to disable the V2 factory, bury the V3 guns, sink the Tirpitz and damage the U-boats' protective pens at St. Nazaire, as well as to attack many other targets which had been impossible to damage before.