It comprises a cast metal bridge mounted on a triangular shaped stand adjustable for height and having a leveling screw with knurled head fitted to one corner. The bridge carries a steel torsion wire stretched across it, one end of which adjustable for torsion wire, by screw. At the centre of the wire a small clamp is fitted which carry light weight metal pointer with an adjustable counter-poise. From the notch near the tip of pointer is suspended a small mass pan with a hook fitted to its underside, to hang either a wire frame or a metal clip carrying a glass microscope slide 75x25x1 mm. The tip of the pointer move over a vertical scale graduated 6 cm subdivided in mms. Supplied complete with wire frame, micro slides clip, six glass microscope slides and spare length of torsion wire.
