When body 1 of the gauge is connected to a space in which the
pressure varies, compressed air is adm itted into port a, affecting
the resistance of the magnet arranged in a -с coil 2. Coil 2
carries threaded member 3 screwed into the gauge body. Leads 4
have term inals d for connecting the coil into a circuit. The pressure
to be measured is determined from the change in resistance.
$4342$SmE,M$