Demonstrating Harmonics and Beats
Richard C. Hitchcock · American Journal of Physics · 1951
A group of ten fixed-frequency audio oscillators having frequencies related by 110(N), where N is an integer, are used. Details of construction of oscillators, audio amplifier, and associated power supply are given. With the oscillators it is possible to demonstrate production of synthetic first and second harmonics by playing two or more tones simultaneously. Five characteristic tones may be played simultaneously to simulate a bell-like tone.