Abstract: The present invention comprises an armature suspended within a resilient means, wherein the resilient means also performs a capillary function in that a wetting agent, such as mercury, forms a captive reservoir which travels upon said resilient means to said armature and thereby performs a self-renewing wetting function with regard to the contact surfaces of said armature. The armature and resilient means are enclosed within an envelope. The envelope has secured therein one or more contacts which interact with the contact surfaces of the armature (in response to an electromagnetic stimulus) and are continually wetted by said interaction.

Abstract: The present invention provides an apparatus for preparing and testing material samples, comprising a back plate and a center section having two mixing chambers formed by two adjacent circular apertures in the center section, each of the mixing chambers having an interior surface with a first angulation sloping down toward the back plate, the center section also including a port in fluid communication with the mixing chambers and the outside of the center section for disposing a material sample within the mixing chambers, the center section being releasably secured to the back plate.