(For deflection magnetometer or tangent galvanometer). Compressing as thick bakelite moulded case of 125 mm dia. with black aluminum dial graduated 0 - 90 four times, anti parallax mirror slot. The special permanent magnet (small in size) and light weight (maximum damping) supported on
a steel pivot by jewel bearing sets. The permanent magnet is designed in such a way so that it has maximum magnetic fields strength.