Measuring spindle 1 slides in
guide b and bears against workpiece
a being inspected. S p in dle
1 moves capacitor plate 3
which is mounted on flat
spring 4. Movable plate 3 and
fixed plate 2 are the plates of
a capacitor whose capacitance
depends upon the size of the
workpiece. The change in capacitance
indicates the size of the
workpiece.
$4340$SmE,M$