Abstract: A method and device for improving xerographic development of non-metallic photoreceptor imaging surfaces containing irregularities of 5 microns or larger by contacting and moving a smoothing and abrading means against the irregular surface in the presence of an interposed hydrodynamic hydrostatic fluid bearing.

Abstract: A break-out washer assembly for facilitating undoing a connection between interengaged complementally threaded elements. The assembly comprises a washer which tapers radially inwardly and is made of a ductile material and a pair of annuli which straddle the washer, the annuli being complementally shaped to the washer and being made of a relatively harder material. The assembly is interposed between opposing shoulders of the threaded elements which are tightened to extrude the washer and impose a hoop stress on it. The connection is undone by breaking the washer at a chosen circumferential position.

Abstract: Apparatus is described for welding a tube to a tube sheet in which the angular relationship of a weld torch supported in a rotor may be adjusted with respect to the rotor axis by changing or rotating a bushing in which the weld torch is supported in the rotor. The distance of the weld electrode from the axis of rotation of the rotor may also be separately adjusted.