Figure 5-3. Stethoscope.
(3) Earpieces. The earpieces are twisted metal tubes with plastic ends.
The plastic pieces protect the ears from the metal. The twisting helps to improve the
quality of sound heard through the stethoscope. The stethoscope should be worn with
the earpieces forward (figure 5-4) to help prevent the sounds picked up by the
diaphragm from being distorted.
Figure 5-4. Earpiece of stethoscope in place for use.