Abstract: A vibratory feeder for feeding low density powered material having a tray, a base and a motor supporting the tray on the base. The motor includes an electromagnet having an AC coil supported on an intermediate leg between the outer legs and an armature having a permanent magnet and two pole plates. The pole plates being disposed in the spaces between the outer legs and the intermediate leg. A rare earth magnet is supported between the pole plates. Spaces between the electromagnet legs and the pole plates providing for a stroke of about 0.2 inch at a frequency of 30 Hertz and a tuning spring connecting the motor to the tray. The tuning spring being adjustable to change the deflection of the tray relative to the motor.

Abstract: A high gradient magnet is disclosed having a coil of superconducting material immersed in liquid helium in a toroidal shaped liquid helium vessel, supported in axial spaced concentric relation to a toroidal shaped liquid nitrogen vessel which forms one end of a toroidal heat shield made of high heat conductive material in which the liquid helium chamber is supported by a first coil support ring and a second coil support ring. The heat shield and liquid helium chamber are in turn supported in a toroidal shaped vacuum chamber which is in turn supported in a heavy iron cylindrical enclosure closed at the ends and having an opening through the center of its ends. A slurry containing iron particles may pass through the opening in the center whereby the iron particles from the slurry are retained by a matrix. The first coil support ring has two ends supported on the vacuum vessel and an intermediate part.