Slotted metal disc, with finger hole and having 12 radial slots, mounted on a handle.
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This unit provides continuously variable D.C outputs for the ripple tank motor, together with a fixed A.C output to operate lamp, supplied with a detachable mains lead.
For use on pump plate not less than 15 cm. diameters Electric Bell operating on 4-6 volts AC/DC, suspended on rubber cord in bell jar. Fine coiled wire connections to terminals mounted in rubber bung sealing the jar
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.
Glass Tube approx. 84cm long and 2.5cm dia mounted on retort stand with clamp and boss, with 500ml glass bulb supported on iron ring, connecting rubber tubing and spring clip.
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