Square section with tapered mouthpiece, made of polished wood overall length 760 mm.

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.

Square section with tapered mouthpiece, made of polished wood, with graduated sliding piston, square in section having a knob at the end for easy handling. The slider is marked with a diatonic scale. It is used to investigate phenomenon of beats in conjunction with a second pipe of same type. Approx. overall length when extended 840mm.

Mounted on sturdy streamlined base with provision for horizontal or vertical use. Fork is manufactured from selected steel. Prong is 10 x 25 x 300 mm. Accurate frequency adjustment, vibrations rate 60 per second. Electromagnet can work on 6 Volts. The amplitude of vibration can vary by sliding the electromagnet inside the prongs.

It comprises two aluminium tubes telescoping into each other, so that the column of air within the tubes may be altered from 30 cms to 53 cms, outer tube fits into a wooden base.

Comprising two plastic tubes one 305 x 32 mm diameter, the other 305 x 25 mm diameter. The small tube slides within the other in foam plastic collars, allowing the air column length to be varied from 300 to 530 mm.

For demonstration of wave motion, helical coil of flat section tempered steel, coil dia 75 mm closed length 11 cms fully extended 3 meters.

For demonstration of wave motion, pulses, reflection and interference, steel wire close wound helix, 19 mm diameter closed length 3 mtrs. extending to approximately 9 mtrs.

With four toothed wheels each 75 mm dia, fixed 6 mm apart on a shaft, projecting as spindle with slight taper at its end. Wheels have 36, 45, 54, and 72 teeth respectively, used with whirling table.