Vintage MLI Current Balance

MLI Current Balance from Mec-test Ltd with serial number 173.Circular spirit balance, and 3 adjustable legs, to enable the user to level the current balance.
Dimensions: 24x10x6 in (61x25. 5x15 cm)
Almost every physics major does an experiment with a current balance. The students measure the force of repulsion between two straight, parallel wires, one fixed, and one moving, by measuring the gravitational force which just balances the magnetic force. The force is proportional to the product of the currents in the two conductors, and depends on the permeability of free space.

MLI Current Balance from Mec-test Ltd with serial number 173. Circular spirit balance, and 3 adjustable legs, to enable the user to level the current balance.
Almost every physics major does an experiment with a current balance. The students measure the force of repulsion between two straight, parallel wires, one fixed, and one moving, by measuring the gravitational force which just balances the magnetic force. The force is proportional to the product of the currents in the two conductors, and depends on the permeability of free space.