Wave from Helix

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.

To determine the standing longitudinal waves in column of air and velocity of sound in air, it comprises of a glass tube approx 1.2 meter length and 34 mm diameter. There is a tightly fitting but adjustable piston on a 390 mm long rod at one end of the glass tube. A loose fitting piston attached to a 1.2 meter long sounding rod at the other end of the glass tube, fitted on a wooden base.