Click here to purchase the entire book in PDF format. Overtone series in a closed pipe TO BE WRITTEN Figure 3.61: The relationship between the position of the probe in a open pipe (the horizontal axis) and the particle velocity maximum and minimum (in black) as well as the pressure maximum and minimum (in red). This diagram shows the fundamental resonance of the pipe. Figure 3.62: The relationship between the position of the probe in a open pipe (the horizontal axis) and the particle velocity maximum and minimum (in black) as well as the pressure maximum and minimum (in red). This diagram shows the first overtone in the pipe - one third the wavelength and therefore three times the frequency of the fundamental. Figure 3.63: The relationship between the position of the probe in a closed pipe (the horizontal axis) and the particle velocity maximum and minimum (in black) as well as the pressure maximum and minimum (in red). This diagram shows the second overtone in the pipe - one fifth the wavelength and therefore five times the frequency of the fundamental.