Abstract: A simple and economical spin fixture which is specially designed to be integrally molded, implanted or otherwise embedded within a solid composition ball, for example, a polymerized thermoplastic foam basketball. The fixture rotatably seats one's fingertip inside the ball to allow effortless fingertip spinning. The gripping action is secure, and yet the frictional contact surface between the rotating and stationary parts is minimized to improve the spin quality.

Abstract: A battery powered light source comprising an electric light bulb; a plurality of air cathodes; a plurality of metal anodes, one for each cathode; a plurality of electrically nonconductive housings disposed adjacent to each other, wherein each housing encloses a respective chamber containing one cathode and one anode which are spaced from each other and form an anode-cathode pair and also encloses a cavity which is below the anode-cathode pair and is in fluid flow communication with the chamber, each housing having a portion defining at least one air passage from its chamber to an adjacent housing, and an opening through which a surface of the contained cathode is exposed to air in the passage. The housings are secured to each other in such arrangement that their respective air-passage-defining portions cooperatively define at least one common air passage. Circuit elements are provided for electrically connecting the anode-cathode pairs to each other and to the electric light bulb.