Abstract: This disclosure relates to a voltage surge arrestor for use with an electric device having a component to be protected from a voltage surge. The arrestor comprises at least first and second electrodes, and a spacer connected to the electrodes and mounting the first and second electrodes in spaced relation. The electrodes have portions which are spaced relatively close to each other and form a gap therebetween, and a gravity movable member is in the space between the electrodes and movable by gravity into and out of the gap, thereby changing the voltage breakdown level in the gap. The arrestor further includes a voltage and current limiting block connected to one of the electrodes. The movable member may be electrically conductive or a dielectric member, and it may be liquid or solid.

Abstract: A motor comprising a stator core having stator windings wound thereon and an elongated outer shell which surrounds the core and the windings, the shell extending lengthwise beyond the end turns of the windings and supporting the motor bearings. The core is slidable in the shell but is retained in place in the lengthwise direction by first and second abutments fastened to the interior of the shell at opposite ends of the stator. At least one of the abutments is a ring which may be removed, thereby enabling easy assembly or disassembly of the motor. The core is retained against angular movement by a key which engages lengthwise extending keyways in the core and the shell. Tubular spacers are mounted between the stator core and the abutments.

Abstract: A primary target for the production of fission products in a nuclear reactor, such as uranium or plutonium fission products, is comprised of an enclosed, cylindrical vessel, preferably comprised of stainless steel, having a thin, continuous, uniform layer of fissionable material, integrally bonded to its inner walls and a port permitting access to the interior of the vessel. A process is also provided for depositing uranium material on to the inner walls of the vessel. Upon irradiation of the target with neutrons from a nuclear reactor, radioactive fission products, such as molybdenum-99, are formed, and thereafter separated from the target by the introduction of an acidic solution through the port to dissolve the irradiated inner layer. The irradiation and dissolution are thus effected in the same vessel without the necessity of transferring the fissionable material and fission products to a separate chemical reactor. Subsequently, the desired isotopes are extracted and purified.