Abstract: A method of treating water to control or eliminate algae and bacterial growth wherein the water is passed through a magnetic field. The magnetic field is generally normal to the direction of flow of the water.

Abstract: A stroboscopic tuning device for a stringed musical instrument that is mounted on the musical instrument adjacent to the strings to be tuned. A solid state circuit employs a frequency generator, such as a piezoelectric crystal oscillator or a tuning fork oscillator, to operate the stroboscopic light source at a preselected frequency. In the use of the device, a string is plucked, and when the vibratory motion of the plucked string is either the fundamental frequency or the harmonic frequency of the preselected operating frequency of the stroboscopic light source, the string will appear to an operator to be in a nonvibrating condition. At that time, the string is tuned or adjusted to the desired tone.

Abstract: In the making of fixed dental prosthesis, a model is employed, which is an accurate replica of the patient's teeth and gums. For reinforcement, the model is fixed to a base. A model comprises a replica of teeth remaining in the patient's mouth and a replica of teeth to be prepared by restorative dentistry. For preparing the teeth by restorative dental techniques, a die is used. It is desired that the die be removed from and replaced in the model with facility, the die be returned to the model in a precise manner, the die be removable from the base on which the model is secured, and the die be prevented from rotating relative to the pin. Toward this end, the pin of the present invention is formed with a tip that is embedded in the extremity of the die facing the model for fixing the die thereto. The tip has a side elevation contour somewhat similar either to a triangular configuration or a rectangular configuration. Extending from the tip is a shank having one portion extending beyond another portion thereof.

Abstract: A rack for storing spent nuclear fuel elements in which a plurality of aligned rows of upright enclosures of generally square cross-sectional areas contain vertically disposed spent fuel elements. Each fuel element is supported at the lower end thereof by a respective support that rests on the floor of the spent fuel pool for a nuclear power plant. An open rack frame is employed as an upright support for the enclosures containing the spent fuel elements. Legs at the lower corners of the frame rest on the floor of the pool to support the frame. In one exemplary embodiment, the support for the fuel element is in the form of a base on which a fuel element rests and the base is supported by legs. In another exemplary embodiment, each fuel element is supported on the pool floor by a self-adjusting support in the form of a base on which a fuel element rests and the base rests on a ball or swivel joint for self-alignment.

Abstract: Racks for storing spent nuclear fuel elements in a spent fuel storage pool are placed in the pool one above the other. Guide pins and guide pin receptacles mate for the alignment of the racks one above the other. A frame-like support removably holds the racks one above the other. Interengaging members between the racks and the frame-like support retain the racks in position relative to the frame-like support.

Abstract: Apparatus for detecting the presence of an object by propagating an electromagnetic field, preferably in the microwave range. An object entering the path of the electromagnetic field reflects, disturbs or interrupts electromagnetic energy. The level of the electromagnetic energy reflected, disturbed, or interrupted depends on the size of the object and the distance of the object from the apparatus. A receiver detects the level of the electro-magnetic energy reflected, disturbed or interrupted from the object. An alarm is set to be activated when the energy level of the reflected, disturbed or interrupted energy detected by the receiver reaches a predetermined level.

Abstract: Apparatus for monitoring the use of television receivers to obtain information for the rating of television programs. The apparatus makes a comparison between the intercarrier frequency signal (i.e., phase) produced by extracting from an operating television receiver tuned to a channel the visual and aural IF frequencies and the respective intercarrier frequency signals (i.e., phase) produced by successively extracting from transmitting sources of television channels the visual and aural IF frequencies. The intermediate frequency signals of the television receiver are sampled and converted into an intercarrier frequency signal. A voltage controlled tuner is tuned to the radio frequency carriers of the various television channels in a hunting sequence. The output signals of the voltage controlled tuner are intermediate frequency signals, which are converted into intercarrier signals.

Abstract: A meter power distribution apparatus in which an interchangeable front panel has line and load stabs mounted thereon that are received, respectively, by load spring clips on a confronting panel for establishing an electrical connection to electrical outlets for a mobile home or the like.

Abstract: A portable, self-contained tennis ball throwing apparatus is disclosed which includes a constantly rotating cam having gradually increasing radii of successive points around its periphery and an abrupt transition from a maximum radius to a minimum radius, a pivotally mounted throwing arm having one end biased into contact with the periphery of the cam and supporting a ball receiving cup at its other end, and a resilient member for biasing the throwing arm, such that the cam effectively cocks the throwing arm at a relatively slow rate and releases the throwing arm to move under the influence of the resilient member to impart a throwing force to a tennis ball. The housing of the apparatus is mounted on a carriage which is movable with respect to the housing to change the pitch angle thereof, and, therefore, the angle of trajectory of a thrown ball. The ball receiving cup is also adjustable to change the angle of trajectory of the thrown ball.

Abstract: A system for administering anaesthesia or analgesia to a patient in a safe and effective way while limiting the escape of the anaesthetic gases into the environment of the patient and the person administering the process.

Abstract: A pipe restraint for nuclear power plants in which a support member is anchored on supporting surface. Formed in the support member is a semicylindrical wall. Seated on the semicylindrical wall is a ring-shaped pipe restrainer that has an inner cylindrical wall. The inner cylindrical wall of the pipe restrainer encircles the pressurized pipe. In a modification of the pipe restraint, an arched-shaped pipe restrainer is disposed to overlie a pressurized pipe. The ends of the arch-shaped pipe restrainer are fixed to support members, which are anchored in concrete or to a supporting surface. A strap depends from the arch-shaped pipe restrainer. The pressurized pipe is supported by the depending strap.

Abstract: Apparatus for tensioning a cable employed for repairing deformed yieldable structures in which one end thereof has a generally U-shaped configuration. The legs of the U-shaped end is joined by a slotted cross piece to receive in locking engagement therewith a cable to be tensioned. Extending from the U-shaped end is an integrally formed threaded rod. A threaded impact tube receives the rod in threaded engagement therewith. The free end of the impact tube is suitably notched to receive a conventional air operated impact wrench. Between the U-shaped end and the impact tube is an abutment member that has a suitable opening to receive a rod. The abutment member engages a fixed upright post or bar. When the impact wrench rotates the impact tube, the impact tube engages the abutment member to maintain a fixed location longitudinally while rotating about its axis. As a consequence thereof, the rod is drawn into the tube and the U-shaped end applies a tension to the cable attached thereto.

Abstract: An underground reinforced plastic enclosure comprising a vertically and circumferentially stiffened body. The body is made of a fiberglass polyester resin and the stiffeners are of a reinforced plastic mortar. The body is suitable for surrounding a transformer or an oil switch used in underground utilities. On the body is seated a top cap made of reinforced plastic mortar. The top cap is formed with a central opening. Seated on the top cap is a reinforced plastic mortar cover plate or a metal grate. Depending from the top cap is a fiberglass polyester resin baffle and tamper shield. The body seats on a base of reinforced plastic mortar. A grade adjustment skirt also depends from the top cap outwardly from the baffle and tamper shield.

Abstract: A microcomputer terminal system in which all input/output devices communicate with a microcomputer through a system bus. The microcomputer includes a microprocessor and a memory. Programs are stored in the memory of the microcomputer. The input/output devices include a keyboard and a cathode ray tube display. Through a read/write memory for the input/output devices interconnecting the keyboard and the cathode ray tube display with the system bus, the microprocessor, the keyboard and the cathode ray tube display perform their respective internal operations independently of the other.The keyboard selectively produces signals representing character data and control data in a serial manner. The data, along with a strobe signal, are entered into a keyboard encoder circuit and from there into the read/write memory for the input/output devices and thence to the read/write segment of the microcomputer memory.

Abstract: A mail box with a signal attachment in which the opening of the door causes a bracket to activate a pivotally mounted hollow signal arm. The activation of the hollow signal arm moves the hollow signal arm into a substantially upright position. Weight means within the hollow signal arm urges the hollow signal arm into a substantially upright position and maintains the hollow signal arm in the upright position until an operator manually resets the hollow signal arm to its initial position.

Abstract: In the making of fixed dental prothesis, a model is employed, which is an accurate replica of the patient's teeth and gums. For reinforcement, the model is fixed to a base. A model comprises a replica of the teeth remaining in the patient's mouth and a replica of teeth to be prepared by restorative dentistry. For preparing the teeth by restorative dental techniques, a die is used. It is desired that the die be removed from and replaced in the model with facility, be indexed accurately relative to the model, and have stability while positioned in the model against forces applied in the practice of prothesis, and also be removable from the base on which the model is secured. Toward this end, a pin is fixed in the die having a locating leg and an indexing leg interconnected by an arcuate portion of the pin. The legs extend outwardly from the die to be received by the base to which the model is secured.

Abstract: An apparatus for cooking fruit and the like products includes a tank or cooking chamber disposed for receiving a quantity of such products and a quantity of water sufficient to cover the products therein and sufficient enough to create the necessary back pressure for a hydraulic head and sufficient enough to provide an adequate medium for agitation. Steam is supplied to the lower portion of the tank to raise the temperature of the water to a cooking temperature of the products submerged therein, which temperature may be the boiling point of water. Steam or moisture laden vapor which escapes to an upper surface of the body of water is recirculated under pressure to a lower portion of the tank, such that it will be redirected into the cooking area. Such recirculation is performed by a conduit and a blower or pump mounted in the path of the conduit. The conduit has an inlet above the level of the water in the tank and an outlet below the level of the water adjacent a bottom wall of the tank.