We give full credit to John Radus for the invention of the switchable magnet and the conditioning of magnets with a memory. And we express our deep appreciation to John Reed for exerting so much effort to find something that was intended by certain parties to have disappeared from history, or at least to have faded into comfortable obscurity. If you're interested in permanent magnet engines, be sure to check the Radus' references cited at the end of this article, and be sure to check the Kawai references. And as an aside to the beginning magnetics engine researcher who does not have a good knowledge of magnetic materials, here's some advice. You must get much deeper into magnetic materials and their behavior.
Magnetic materials are highly nonlinear.
The field from every permanent magnet has an internal, hidden, dynamic structure. There are dynamics going on inside the field of a permanent magnet, and comprising that field. Magnetism is intimately connected with the spins of the fundamental particles, and you need to understand that area as well. So unless you wish to be a very na ve experimenter, first do some heavy homework in the areas of magnetic material phenomena, different types of magnetism, multivalued magnetic potentials, magnetic monopoles, interferometry, spin waves and phenomena, etc. If you're really serious, contact the publisher and get permission to legally reproduce it at the copiers for a small fee, as we did.