(For deflection magnetometer or tangent galvanometer) Compressing a bakelite moulding case with white aluminum dial graduated 0- 90 four 0
times. The magnet with aluminum pointer is pivoted at the jewel so as to move frictionless.
(For deflection magnetometer or tangent galvanometer) Compressing a bakelite moulding case with white aluminum dial graduated 0- 90 four 0
times. The magnet with aluminum pointer is pivoted at the jewel so as to move frictionless.