PURPOSE: To demonstrate the resonance behavior of a Helmholtz resonator..
DESCRIPTION: Helmholtz resonators are a series of hollow cavity resonators made of spun brass. A set of tuning forks matches the resonators. Each resonator has a small nipple that is inserted into the ear. Opposite to the nipple is a hole. While the resonator is held in the ear a tuning fork is brought to the hole. The response of the resonator to the tuning fork is heard by the ear. Resonances in the system are sensed.
Also in the hallway display are some hand held acoustic resonators, shown in the above right. These were studied as the first phones.
This equipment has been archived in the history of science display on the third floor and is generally unavailable for classroom demonstration use. But this information is presented here because it can be discussed in class and observed at the hallway display by the students.
EQUIPMENT: Helmholtz resonators, as photographed.
Updated by Jun Qi in 4/5/2000