Abstract: Diamond is produced by chemical vapor deposition on a substrate by hot filament activation of a hydrogen-hydrocarbon gas mixture. An edge of the substrate faces the filament at a distance therefrom up to about 1 mm and preferably about 0.3-0.7 mm., and the substrate is moved relative to the filament to maintain this spacing as diamond forms thereon. Diamond formation proceeds at an improved rate, and in single crystal configuration under certain conditions.

Abstract: Diamond is produced by chemical vapor deposition on a substrate by hot filament activation of a hydrogen-hydrocarbon gas mixture. An edge of the substrate faces the filament at a distance; therefrom up to about 1 mm. and preferably about 0.3-0.7 mm., and the substrate is moved relative to the filament to maintain this spacing as diamond forms thereon. Diamond formation proceeds at an improved rate, and in single crystal configuration under certain conditions.

Abstract: An apparatus and method for inducing and measuring crack growth in a solid by using a double cantilever beam assembly which includes a fracture specimen with a notch that defines a pair of spaced outwardly extending beams terminating at an end where growth of a crack occurs, and a spring assembly for continuously urging the spaced beams apart with a substantially constant pressure that creates a spreading pressure at the end where crack growth occurs to stress the fracture specimen at the end. An electromagnet assembly is used to cyclically apply and remove the spreading pressure caused by the spring assembly.

Abstract: A magnetic resonance (MR) surgery system facilitates surgery with a focussed ultrasound transducer that selectively destroys tissue in a region within a subject. The focussed energy transducer dissipates energy at a focal point within the region of tissue to be destroyed. A non-magnetic positioning device having a vertical dimension small enough to fit easily within the bore of an MR magnet moves an energy transducer in a limited vertical space. The positioning device employs a plurality of hydraulic positioners and an inclined plane to position the ultrasound focal point under the control of an operator. An MR imaging system employing a temperature sensitive pulse sequence creates an image of the tissue and the region being heated to allow the operator to adjust the position of the ultrasonic transducer so as to direct ultrasonic energy to the appropriate location.

Abstract: The present invention enables the diamond coating of stationary elongate objects, such as twist drills, with a continuous uniform film without any motion of the twist drill due to the unexpected superb "throwing power" of a reactor disclosed herein. The CVD diamond reactor includes a vacuum chamber, inlet for feed hydrogen/hydrocarbon mixtures, and an outlet, in conventional fashion.

Abstract: A magnetic resonance surgery system facilitates performance of surgery with a focussed ultrasound transducer that selectively destroys tissue in a region within a subject. The focussed ultrasound transducer dissipates ultrasonic energy at a focal point within the region of tissue to be destroyed. A number of hydraulic positioners position the focal point under the control of a surgeon. A magnetic resonance imaging system employing a temperature sensitive pulse sequence creates an image of the tissue and the region being heated to allow the surgeon to adjust the position of the ultrasonic transducer so as to direct ultrasonic energy to the appropriate location.

Abstract: The present invention enables the diamond coating of stationary elongate objects, such as twist drills, with a continuous uniform film without any motion of the twist drill due to the unexpected superb "throwing power" of a reactor disclosed herein. The CVD diamond reactor includes a vacuum chamber, inlet for feed hydrogen/hydrocarbon mixtures, and an outlet, in conventional fashion.

Abstract: Diamond is deposited by chemical vapor deposition on two parallel substrates, by means of a plurality of filaments between said substrates. The substrates and filaments are in vertical configuration and the filaments are linear and spring-tensioned to compensate for thermal expansion and expansion caused by filament carburization. The apparatus includes at least one and preferably two temperature controlling means, usually heat sinks, to maintain substrate temperature in the range of 900.degree.-1000.degree. C., for optimum rate of diamond deposition.

Abstract: A plural substrate CVD apparatus for diamond crystal production utilizes spaced apart vertical, parallel, planar substrate panels with an electrical (direct current, D.C.) resistance filament heater therebetween. A hydrogen-hydrocarbon gas mixture flows between panels to come into contact with the heater and the panels to cause diamond crystal nucleation and growth on the substrate panels. The apparatus includes means for maintaining the spaced relationship of the heater from the substrate surfaces, comprising a rod member attached to one end of the heater and tensioned by a cable passing over a pulley member and attached to a weight.

Abstract: Diamond is deposited by chemical vapor deposition on two parallel substrates, by means of a plurality of filaments between the substrates. The substrates and filaments are in vertical configuration and the filaments are prestressed to curve in a single plane parallel to the substrates, to allow for thermal expansion and expansion caused by filament carburization. The apparatus includes at least one and preferably two heat sinks to maintain substrate temperatures in the range of 900.degree.-1000.degree. C., for optimum rate of diamond deposition.

Abstract: A dynamically stiffened rotary tool construction is disclosed. The preferred stiffening means are a pair of spaced, adjustable, rotatably-mounted cam followers.

Abstract: Transformer cores are made electrically conductive during impulse voltage condition when a certain voltage is attained by a coating of semiconductor material applied to the edges or surface of the core laminations. Under ordinary operating conditions the semiconductor material provides a high resistance path to charges in the core. Upon the occurrence of a high voltage impulse, the semiconductor material rapidly equalizes the charges in the laminations and so avoids the danger of breakdown of the insulating coatings between individual laminations.

Abstract: Transformer cores are made electrically conductive during impulse voltage condition when a certain voltage is attained by a coating of semiconductor material applied to the edges or surface of the core laminations. Under ordinary operating conditions the semiconductor material provides a high resistance path to charges in the core. Upon the occurrence of a high voltage impulse, the semiconductor material rapidly equalizes the charges in the laminations and so avoids the danger of breakdown of the insulating coatings between individual laminations.

Abstract: A vacuum interrupter latch release mechanism employs a pivotably mounted trigger action arm in cooperation with a support arm assembly to resist the force of a main spring until the normally closed interrupter must be opened. Rotating the trigger action arm causes a catch on the trigger arm to become disengaged from an associated stop provided on the support arm assembly and allows the support arm assembly to pivot under the force of the main spring while being resisted by its weaker support spring. The rotation of the support arm is accelerated by the main spring. After a short stroke, an associated linkage impacts a stop on the vacuum interrupter which then becomes opened. The large force of the main spring causes virtually no wearing effect on the catch and stop faces over long periods of continuous operation.