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Before using tangent galvanometer for th...

Before using tangent galvanometer for the measurement of current, why is the plane of coil of tangent galvanometer set in the magnetic meridian?

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When plane of the coil of tangent galvanometer is set in the magnetic meridian and current is passed through the coil, then the magnetic field produced due to current in coil is perpendicular to the plane of coil in East-West direction. The horizontal component of earth is in South-North direction. Then the magnetic needle of tangent galvanometer will obey tangent law, and current (I) can be measured by noting the deflection `theta`.
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