The voice was concentrated upon it by means of a mouthpiece and a diaphragm.
The character of the diaphragm is best observed in year-old canes.
Underneath the stage, which is pierced by a circular aperture, is a diaphragm.
It has a diaphragm provided centrally with a blunt pin, or stylus.
The pleura and diaphragm also showed a good deal of disease and some adhesion.