This reflector has a screw-on brass-covered lead weight at one end. At the centre there is a curved sight vane with a slit and three sight holes. At the top of the sight vane is a screw and slit so that a wire could be strung between it and the base. After the sight vane, there is an adjustable circular disc with a mirror on one side and a white plate on the reverse. After this, there are two upright arms holding a circular filter each. The whole instrument is pivoted at the centre.