Tuning Forks Set of 13

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.

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.