• Tangent galvanometer is an early measuring instrument for small electric currents.
  • Its working is based on the principle of the tangent law of magnetism, which states that when a current is passed through a circular coil, a magnetic field is produced at the center of the coil in a direction perpendicular to the plane of the coil.
  • Our instrument comprises of an insulated copper coil wound on a non-magnetic bobbin of Bakelite, about 162.5 mm in diameter.
  • The copper wire consists of three sets of windings, with 2, 50 and 500 turns, fitted with 4 terminals, for connection to the coils and is marked for each coil.
  • This frame is mounted on a non-magnetic tripod metal base, supported by leveling screws.
  • The coil can be rotated on a vertical axis passing through its centre.
  • A compass box (Magnetometer) is mounted horizontally at the centre of the ring. It is detachable and can be used separately for magnetometer work.
  • It has an aluminium dial, 100mm in diameter, graduated 0-90° four times, an anti-parallax mirror, and an agate centered magnetic needle fitted with an aluminium pointer designed to provide adequate damping.


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