When the pressure varies in
chamber 6, diaphragm 1,
through rods 2 and 3, changes
the ohmic resistance of carbon
piles 4 and 5. If carbon piles 4
and 5 are connected into a bridge
circuit so th at the resistance
of each carbon pile is a separate
arm, and a d-c voltage is a p plied
to the bridge in p u t, we
o b ta in an a -с voltage at the
o u tp u t th at is proportional to the pressure in chamber 6.
$4340$SmE,M$