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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

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

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 are obtained with bent rods running in metal guide