For use on pump plate not less than 15 cm. dia 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 sealin....
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On sturdy streamlined base with provision for horizontal or vertical use. Forks is manufactured from selected steel. Prong is 10 x 25 x 300 mm. Accurate frequency adjustment, chrome plated, vibrations....
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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.

Consists of a chrome plated brass resonance tube 100 cm long, brass reservoir 250 ml and a metre scale mounted on a metallic stand. With rubber tubing.

The versatile apparatus may be used as demonstration model with an overhead projector or as an economical method of allowing pupils to carry out their own investigations. Four legs are provided enabli....
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Best quality nickel-plated, plain shanks, with frequency marked, C (256), D (288), E (320), F (341), G (384), A (426), B (480), C (512). Complete set of EIGHT tuning forks, supplied in velvet case.

For demonstrating the movement of progressive transverse waves. Comprises 22 small balls on wire rods, with eccentric motion attachment, with driving handle and fitted on polished wooden base.

Stand overall height 43 cm. for use in vertical or horizontal position, fitted with handwheel and wire helix belt drive to pully. Suitable for use with Savart wheel and disc and adopter to accommodate....
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For demonstrating the production of beat frequencies. Comprises two nickel plated forks A (426.6) mounted on individual boxes. One fork is provided with adjustable mass by means of which frequency may....
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For demonstrating longitudinal and transverse motion, Consisting a number of eccentric disc supporting a series of metal rods on revolving the handle, transverse waves are obtained. Longitudinal waves....
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Steel wire close-wound helix 19mm, diameter, closed length 3 meters extending to approx. 9 meters, with looped ends.

For demonstrating wave motion. Helical coil of flat section tempered steel wire. Coil diameter 7.5 cm length closed 10 cm. fully extended 3 meters.

Comprising a wooden resonance box of 114 cm length, 12.5 cm width and 10 cm height, with two rules 1 meter long sub-divided into millimeters. One each brass and steel wire of different diameter attach....
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