47" 3-Wire Sonometer for Mersenne's Law

This 47-inch sonometer features a hollow wooden sounding box measuring 1290 x 130 x 110mm with scales divided in mm between fixed bridges over which the wires are stretched. One wire is fitted with a 100N x 5N spring balance for tension measurement and fine adjustment. Another wire passes over a pulley and can be loaded as desired, and a third wire is provided for comparison with wrist-pin tension adjustment. The distance between fixed bridges is 720mm. The sonometer comes complete with three movable bridges, a wrist-pin key, and a set of four 1.5m steel wires (20, 22, 24, and 26 SWG). Weights are not included. Suitable for physics classrooms studying Mersenne's law, vibration of strings, and acoustics.