Abstract: A unitary targeting device is used to align a machined plane of a workpiece, for instance an industrial assembly fixture, with the optical axis of a reference instrument. The disclosed device and method are designed to fully utilize the depth of field of the reference instrument to sense misalignment in a single sighting.

Abstract: A method for surveying is disclosed which functions to define all curves, grades and super elevations to a parabolic shape by impinging two laser beams, each of which is provided with a grid type means so as to create a diffracted fan of beams emitted from each laser. The intersections of these beams are utilized to form the parabolic shapes.

Abstract: A system and method of determining the angular displacement of one or more members is disclosed. A reference laser beam is diffracted, reflected and impacted upon a face of a display as a light pattern in which the pattern spacing is representative of a determinable angular displacement relative to a reference pattern.

Abstract: A fine mesh, cylindrical screen is mounted on a cylindrical support lengthwise of a ditch and rotated about its axis. The screen is over half submerged, such as leaving 30% of its area above the normal water level. The rotating screen, at its downstream end, abuts the pipe through which the water flows to a pump for supplying the sprinklers.As the screen rides up out of the water, the sediment clings to it. At the downstream end is a nozzle which discharges a jet of water to move the sediment longitudinally and to a position of engagement with a jet of water from a second nozzle spaced both longitudinally and circumferentially from the first nozzle. These nozzles are included in a series of nozzles which are similarly spaced to the upstream end, with the jet from the last nozzle moving the collected sediment to a position engageable by a suction nozzle just before the screen reenters the water.A special dam downstream from the screen normally insures that the water at the screen will be at the desired level.

Abstract: An endless screen extends around an upper roller, above the stream of a ditch or the like, and a lower roller, submerged in the stream. A cleaning brush engages the underside of the lower reach of the screen, the brush rotating in a direction opposite to the movement of the screen, while a roller or rod supports the screen just below the brush. The brush may be driven directly from a motor and speed reducer, with a belt drive to an upper pulley producing further speed reduction, or a speed reduction drive between the motor and the brush with a belt or chain drive to the upper roller may be utilized.The lower roller for the screen has a fixed center surmounted by a plastic or rubber bushing about which a cylinder of the lower roller rotates.A weir directs water onto the screen, the weir including a transverse partition mounted in the ditch and having a rectangular slot therein.