Abstract: Disclosed is a battery connector for attaching an electrical cable to the terminal post of a battery. The connector has a hole penetrating therethrough which is adapted to fit around the terminal post. The interior surface of the hole bears a threading helix having a diameter less than that of the terminal post for screwing said connector onto said terminal post.

Abstract: A thin transparent glass sheet is bonded to the substantially flat planar front face of a cube-corner-type retrodirective reflector formed of a light-transmitting synthetic organic resin for covering at least the reflex reflective area thereof. A liquid urethane resin radiation curable to a transparent solid state is applied to the front face of the reflector and one side of the glass sheet is coated with a silane solution which is allowed to dry, and which side is then placed against the urethane resin on the reflector front face and pressed thereagainst until all air bubbles have been forced from the urethane resin and it has spread to a layer of predetermined thickness.