Abstract: An agricultural machine for smoothing ruts, such as are produced in a field by center pivot sprinkler irrigation systems, comprises a pair of rotary tillers arranged in a unique frame for traveling over and along respectively opposite sides of the rut as such tillers are rotated toward each other to break up clods of soil ridged above the rut at opposite sides thereof and to largely fill and smooth the rut. A guide shoe carried by the frame midway between the rotary tillers is preferably provided to travel along the rut and maintain the rotary tillers at proper working positions, and a hood with outriggered side walls hinged thereto for outward swinging movement preferably covers the rotary tillers.

Abstract: A nuclear reactor system is described in which a position indicator is provided for detecting and indicating the position of a movable element inside a pressure vessel. The movable element may be a valve element or similar device which moves about an axis. Light from a light source is transmitted from a source outside the pressure vessel to a first region inside the pressure vessel in alignment with the axis of the movable element. The light is redirected by a reflector prism to a second region displaced radially from the first region. The reflector prism moves in response to movement of the movable element about its axis such that the second region moves arcuately with respect to the first region. Sensors are arrayed in an arc corresponding to the arc of movement of the second region and signals are transmitted from the sensors to the exterior of the reactor vessel to provide indication of the position of the movable element.

Abstract: A system is disclosed for promoting selective shell-side flow distribution between and providing structural support for modular straight tube bundles in a heat exchanger or the like, wherein a plurality of flow guides, each of which includes three axi-symmetrically-located radial panels, are connected along their outer radial edges to form a polygonal array establishing mutually shared partitions between modular tube bundles. Various flow guide configurations permit gaps in the mutually shared partitions to promote uniform shell-side communication between the modules, and accommodate individual tube bundle support grids in assembled relation with the flow guides.

Abstract: A valve assembly having remotely replaceable bearings is disclosed wherein a valve disc is supported within a flow duct for rotation about a pair of axially aligned bearings, one of which is carried by a spindle received within a diametral bore in the valve disc, and the other of which is carried by a bearing support block releasably mounted on the duct circumferentially of an annular collar on the valve disc coaxial with its diametrical bore. The spindle and bearing support block are adapted for remote removal to facilitate servicing or replacement of the valve disc support bearings.