Additional Info

• ID Code: H3-25
• Purpose: Produce high-frequency tones.
• Description: This device consists of a very short tube which can be activated by blowing air past an edge using the bulb. The tube is calibrated (in mm of increased tube length), and can produce both high-frequency audible pitches and ultrasonic frequencies. (The manufacturer's instructions recommend calculating frequency as of a 1/4 wavelength organ pipe, with the internal plunger moving from 0 to 9mm from the opening.)

  Consider polling students to see how many can hear the various frequencies.

• Availability: Available
• References: REFERENCES: (PIRA 3C20.15)
• Loc codes: H3