Resonance Apparatus:

For experimental determination of the wave length and velocity of sound in air by locating resonance positions of an air column. Consists of a graduated neutral glass tube (I x d), 900 x 25mm, connected by a rubber tubing and pinch cock to an aluminium water reservoir,  securely mounted to a metal support. The reservoir can be raised or lowered for adjusting the length of the air column. A tuning fork is required. (not supplied).