Abstract: The present invention provides a mechanism for centering the screw base of an incandescent lamp in the socket of a porcelain base having thread segments molded directly onto the inner wall of the socket. A bias contact is provided at the inner wall of the socket for centering the base of the lamp by biasing it in two lateral planes along two planar faces, the pressures from the two faces being perpendicular to the faces and thus directed toward the axis of rotation of the screw base. Thus, the base is continuously centered, so that its center contact makes electrical contact with a centrally located bias contact mounted in a pocket formed in the center of the closed end of the socket. The bias contact and the centrally located contact are in turn connected to electrical leads which extend through the closed end of the socket.

Abstract: Disclosed is a solar heater adapted to be made in modular units and used as such or alone, each unit comprising a container, generally triangular in cross section, made up of equal dimensional reflective (two in number) and transparent (one in number) sidewalls, plus two equal dimensional reflective end members of like cross section. Disposed in the container is a conduit and an enlargement of same, the geometric center of said enlargement being coincident with the geometric center of the container. The enlargement is spaced apart from the two reflective and the transparent sidewalls and as a result of the shape of the container and disposition of the enlargement in it, the enlargement is heated by solar rays from its top and its underside, thereby giving rise to a solar heater of significant efficiency.