Abstract: A new nonfuming, soldering and brazing flux particularly useful in soldering aluminum surfaces which comprises a mixture of zinc bromide and an alkali metal bromide such as potassium bromide.

Abstract: A method of making an ironer roll cover which comprises impregnating a less than full-width longitudinal portion of a sheet of fabric with a liquid thermosetting resin and curing the resin. The unimpregnated portion of the fabric acts as a liner or padding for the impregnated portion, while the impregnated portion serves as the work-contacting surface. Because the liner portion and the work-engaging portion of the cover are integrally formed from a single sheet of fabric, no seam or stitching is required for joining the two portions. Thus, the unevenness caused by a seam is eliminated and manufacturing costs are reduced. In a preferred embodiment, liquid water is applied in a narrow band between the impregnated and unimpregnated sections of the fabric to achieve a less than full impregnation, thereby providing a transitional zone between the liner and the work-contacting portion of the cover.

Abstract: An amusing and challenging device composed of a closed container divided into a plurality of chambers by a barrier, or barriers, and a plurality of movable bodies, usually spherical, encased therein. The container, barrier and movable bodies are of electrically insulating material and the movable bodies are of such small size that after the container is agitated, a sufficient static electrical charge is produced by the friction on the movable bodies so as to cause them to adhere to the walls of the chambers. The objective of this device is to challenge ones ability to locate all of the movable objects into one chamber after the unit has been sufficiently agitated, therefore the container and barriers are made of transparent materials to allow easy viewing of the objects therein. In the presently preferred form of the device there is one barrier, dividing the container into two chambers, and a plurality of movable spherical objects.

Abstract: A vacuum bushing for an ultracentrifuge that minimizes excessive oil loss due to the high pressure differential across the bushing and allows automatic reclaiming and reusing of a major portion of the uncontaminated oil flow. The bushing is provided with first and second annular chambers, one chamber being connected to an atmospheric oil reservoir and the other chamber being connected to a vacuum oil reservoir. The major oil flow is from the atmospheric reservoir to the first chamber, along the rotor drive shaft to the second chamber, and then to the vacuum reservoir. The vacuum reservoir is connected to the atmospheric reservoir by a one-way check valve so that the oil is automatically returned to the atmospheric reservoir when the centrifuge is deactivated and the vacuum released.