Abstract: An improved electromagnetic induction method and apparatus therefor for simultaneously collapsing and propelling a deformable annular-shaped workpiece of relatively lightweight construction in a direction outwardly of the apparatus and along its axis wherein the apparatus is made up of seven different embodiments for carrying out the method. Each apparatus is generally comprised of a framework. The framework includes at least one pulse coil means; and a power supply circuit is connected to the pulse coil means. Annular-shaped surface portions of various embodiments of the apparatus define part of an aperture or passageway for receiving a workpiece and function to position the workpiece in mutual inductance relation to the coil means.