The conversion of electric energy into mechanicalenergy. Star-shaped copper disc 9 cm. Diameter rotatable verticallyon pair of adjustable centers and dipping into mercury trough betweenthe vertical limbs of a small horseshoe magnet on a wood base15 x 10 cm. The other terminal isconnected to the mercury trough. The apparatus will operates on 4volts at which voltage it takes 1.8 amps. without battery. Disc adjustable vertically on metal pillar which is connectedto one of two terminals mounted on base.