WM7.2 Tuning Forks
Tuning forks are instruments made in such a way that they vibrate to produce only one pitch. There is a variety of forks. Two forks of the same frequency are mounted onto boxes, one end open, the other closed. Qualitative analysis with these can be expounded. The other benefit of the mounted forks is that when placed next to each other and one is struck, the other will pick up the vibration. If the class is very quiet, strike one, let it vibrate, and then stop it by placing a hand on it. The class can faintly hear the other one.