Abstract: A magnetic suspension system employing magnetic force-applying means associated with a movable object, in which electrical signals which are a function of at least the rate of change of displacement of said object are applied to said force appliers to restore the object to a reference position whenever it is displaced therefrom by external forces, and in which electrical signals are also applied to said force appliers to produce permanent magnetization therein sufficient to maintain said object in its stable equilibrium position without the application of appreciable power in the absence of further external forces tending to displace it therefrom.

Abstract: A tennis racket or other striking implement for minimizing the shock imparted to the arm of the user, having a head or striking portion and a handle portion provided with a longitudinal slot lying in a plane substantially parallel to the striking face, said handle having a longitudinal hole in the end thereof remote from the striking head to accommodate an insert of resilient elastic material slightly larger than the hole diameter such as to produce spreading of the parts of the handle on either side of the slot when the insert is introduced into the hole, and a grip-enhancing binding on the handle applied in a manner to urge the two parts of the handle together and to compress the insert. Preferably the insert is of highly compressed rubber, but it may comprise natural or synthetic rubber. The invention may be applied to striking implements having handles made of wood as well as to those having tubular handles of metal, fiber glass or other materials.

Abstract: An electric motor system comprising a rotor including permanent magnets providing a plurality of correspondingly directed magnetic poles angularly displaced around said rotor, a stator comprising first and second windings adapted to cooperate with the poles of said rotor, each of said windings having transversely disposed conductive portions for intercepting the magnetic fields of said poles during rotation of said rotor, and an amplifier having its input coupled to said first winding so as to be energized by alternating voltage induced in said first winding during rotation of said rotor, and having its output coupled to said second winding to supply alternating current therethrough in synchronism with the interception of the magnetic fields of said poles by the transverse portions of said second winding.

Abstract: A method is described for producing permanent magnets, in accordance with which magnetic material in finely divided or powdered form, comprising an alloy of a rare earth metal and cobalt, is first premagnetized by subjecting it to a high-intensity magnetic field to magnetize the individual particles thereof, the particles are then introduced into a hardenable resinous material and caused to be distributed substantially uniformly throughout at least a region of said resinous material. While said particles are being introduced into and distributed throughout said resinous material, they are subjected to a magnetic field to align them magnetically. The resinous material is then hardened to form a body thereof in which said particles are maintained in magnetic alignment to form an effective permanent magnet structure. In preferred forms of the invention, fibrous material and/or fiberglass cloth or mat may be embedded in the matrix to enhance its strength.