Precautions in using a Tangent Galvanometer

Precautions in using a Tangent Galvanometer Points : Precautions in using a Tangent Galvanometer (a) To avoid eccentric error, readings of both ends of the pointer should the taken and mean of them should he used in calculation.
(b) Reading should be taken by reversing the current. This will eliminate error due to the coil not being the magnetic meridian.
(c) The galvanometer coil should be exactly produced due to circulation of current in it will not be horizontal. In that case the horizontal component of the field F is to be used for calculation.