Simple Pattern Sonometer
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A wooden resonance box 1140mm long, 125mm wide and 100mm high. At one end of the base are two 50N spring balances with hooks and at the other end are two corresponding wrest pins. Also included are three bridges; one large (to span wires) and two small (for the individual wires). Supplied with two steel wires, 30 swg, 1 metre long.