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Barlow Wheel
Barlow Wheel
Barlow Wheel has star-shaped copper disc rotate vertically on pair of adjustable centres and dipping into mercury trough between the vertical limbs of a small horseshoe magnet on a wood base. Disc adjustable vertically on metal pillar, which is connected to one of two terminals mounted on base. The other terminal is connected to the mercury trough. The apparatus will operates on 4 volts at which voltage it takes 1.8 amps, with out battery.