Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 571
struments of that class, the mouth-piece has the form of a cup (Fig. 371),which when applied to the lips permitsthem to act as stretched membranes,determining the vibration of the air inthe tube. The frequency of vibrationdepends in part upon the tension of thelips, and in part on the pressure of… … Fig. 372. vertical section and B the position of the cords in tone pro-duction, as seen from above. These folds, when stretchedacross the head of the windpipe from front to back, leave a
Physics
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