Abstract: Liquid crystal light valve projection systems can use substantially all of the reading light from a high intensity reading light source by converting all single polarization state. Light reflected from a polarization beam splitter (44) that cannot be used because it is of wrong polarization state is recovered with improved efficiency, color balance and collimation by means of a polarization recovery prism (50) employing a reflective surface (56) interposed between two quarter-wave retarders (58,60). The light of wrong polarization from the polarizing beam splitter (44) is passed through a first quarter-wave retarder (58), which circularly polarizes the beam. The beam is then reflected from a mirrored surface (56) to reverse the direction of the circular polarization.

Abstract: The drive member includes a threaded portion for installation on the crank shaft of a fishing reel. A head of the drive member is adapted to abut the reel crank to retain same in place on the crank shaft. A shank of the drive member projects outwardly from the drive member head and is of a cross section for inserted engagement with the chuck of a cordless screwdriver. The present drive member permits optional manual or powered reel operation.