Abstract: A centrifuge for rotating test tubes and the like about a rotational axis includes a drive shaft and a plurality of handles connected thereto to support respective test tube attachments. Each test tube attachment includes two concentric rings, an outer ring pivotally connected to the handle by two diametrically opposed radial pivots and an inner ring pivotally connected to the outer ring by two radial pivots arranged perpendicular to the other radial pivots. The inner ring seats an axial bearing which rotatably supports a container capable of holding in place a test tube.

Abstract: A back belt for use by sailors particularly in racing to provide support when a sailor is inclined out from a side of the ship to counterbalance the inclination of the boat, the belt having portions to extend around crotch, waist, back and over the shoulders of the wearer, a front located hook device and an arrangement for an adjustable back support plate. The belt has a back portion that extends substantially the length of the back of a user and receives a supporting plate therein. The supporting plate is connected at its upper most end by adjustable straps that extend over the shoulders of a user and connect to a hook device in the front of a user. The bottom most portion of the supporting plate connects to an adjustable fork strap that extends under the crotch of a user and connects to a hook device on the front of a user. The supporting plate may be adjustably positioned relative to the back portion.