Examples of floating metal body-surface electrodes (a) Recessed
electrode with top-hat structure. (b) Cross-sectional view of the electrode in (a).
(c) Cross-sectional view of a disposable recessed electrode of the same
general structure shown in Figure 5.9(c). The recess in this electrode is formed
from an open foam disk, saturated with electrolyte gel and placed over the
metal electrode.