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Magnetostatic Gauss' Rifle EM-h1h
A ball rolling in a groove bumps into an array of magnet-ball-ball, firing off the last ball of the sequence. Single shot (4 balls) and multiple-stage, magnetostatic accelerator versions available. PIRA DCS classification:   5H10.701

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University