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Since it was a public conference I will explain the details. Imagine a tub wound in a spiral pattern. This tub is place on a rotating platform and which moved the whole thing in a small circle. Like the small circle you make with your hand if you picked up your mouse and spun it around by the cord. A ball is dropped into the center of the spiral and experience something like constant acceleration tangentially to the circle is moves around the spiral. Finally it reaches the end of the tub and flys out a high velocity. Since the motion of the spiral tub is constant you can dumb any number of ball bearings in at the same time. I.E. insane rate of fire. The speeds they were talking about getting in test were pretty amazing but the math and physics behind it were completely sound. The hard part really would be packaging it into a viable weapon system.