Abstract: A mineral concentrator, including a main support base interconnected to a deck by a flexible support and an oscillator assembly, for recovery of free minerals from a mixture of screened raw materials is disclosed. A symmetrical deck is divided in equal parts by a longitudinal center line plane and includes two sloping surfaces extending laterally and longitudinally downwardly and away from a feed end of said deck. Water and raw material are continuously supplied at the feed end of said deck and moved along the sloping surfaces. First riffles are defined in association with the sloping surfaces and generally perpendicularly to a fall line. The first riffles intercept said raw material and terminate at a point allowing the water and entrained waste materials to fall to the side of the deck for removal from troughs positioned thereat.

Abstract: A rotating aerial device intended for use as a toy has a circular ring having a cross-sectional configuration of an airfoil. The airfoil is defined by an outer circumferential edge and an inner circumferential edge which define the extremeties of a chord line of the airfoil cross-section. The airfoil cross-section also includes a top camber, a bottom camber, and a body thickness.