A galvanometer works on the principle that a current-carrying wire placed in a magnetic field experiences a mechanical force (Lorentz force). By coiling the wire and placing a magnetic needle at the center, even a tiny current produces enough torque to move the needle.
To turn this into a more precise "Tangent Galvanometer," you can follow advanced designs from National MagLab which use a vertical coil and the Tangent Law to calculate absolute current values. how to make a galvanometer
Carefully slide the coil off the former. Use tape or glue to hold its shape. Mount the coil vertically on the base so its center is open. A galvanometer works on the principle that a
: To remove insulation from the wire ends. how to make a galvanometer