A method for the precise measurement of the velocity of sound is described in which the driving‐point impedance of a loudspeaker connected to a closed tube of variable length is the frequency‐controlling element of a bridge‐stabilized oscillator. The operation of the system and the accuracy of measurement are analyzed. Results of measurements in air at 1 kc/sec, room temperature, and atmospheric pressure yield, when corrected to standard conditions, a velocity of 331.45±0.05 m/sec.