A rubber ring mounted on a metal disc with steel rod and wooden handle
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100-10,000 RPM/flash per min. Accuracy: +/- (.05% +1d).
Three Tuning forks are mounted on three wooden resonance boxes dimensions of which are compatible with frequency of the forks to produce a strong sustained tone. Forks are nickel plated with shanks to screw in the bushes on the top of the boxes. Each set supplied with rubber headed hammer.
Made of varnished wood with glass front and membrane suspended on cord for loading with sand to show positions of nodes and antinodes, overall length 760 mm.
Simple type model, it comprises a wooden board 700 x 90 mm (L x W) on four feet, fitted with two steel wires about 0.3mm x 1m (dia x length). At one end of base there are two 50 N spring balances with hooks and at the other end are two wrest pins, supplied complete with three bridges, one large, to span both wires and two small bridges for individual wires, two steel wires 0.3 mm dia. x 1 meter long.
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