Making a Manometer
What will be an ideal response?
You can make a simple manometer using a plastic cup, tape, and a soda straw. Place the tape on the glass so that it runs from top to bottom. Identify a level to which you will fill the glass with water and mark that place as “0.” Make marks at centimeter increments. Place a small pinprick hole in the soda straw, fill the glass with water up to the zero mark, and demonstrate pressure! If you push the straw down to the 2-cm mark and can blow bubbles, you can sustain 2 cm H2O intraoral (and, subsequently, alveolar) pressure. We require 3–5 cm H2O sustained for about 5 seconds for speech to generate sufficient transglottal pressure to vibrate the vocal folds. Following is a scan from the text of the device. Credit for the concept clearly goes to Hixon, Hawley, and Wilson, 1982! Note that a lab on this has been included as well.
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