Used chiefly as a demonstration apparatus, the Wimshurst machine is an electrostatic device capable of generating high voltages. The device has two large glass or mica discs that rotate in opposite directions, and each disc is in contact with a thin metal wiper that produces a charge on the disc by induction. The machine was named for its inventor, British engineer James Wimshurst, who developed it in the early 1880s. What defect in earlier electrostatic generators did Wimshurst eliminate? Discuss