Comprising a wooden baseboard 98 x 9cm mounted on four feet. At one end of the base are two 50N spring balances with hooks, and at the other end are two corresponding wrest pins. Also provided are three bridges, one large to span both wires and two small f
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Comprising a wooden baseboard 98 x 9cm mounted on four feet. At one end of the base are two 50N spring balances with hooks, and at the other end are two corresponding wrest pins. Also provided are three bridges, one large to span both wires and two small for the individual wires.
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