Page:Electricity (1912) Kapp.djvu/111

Rh material, such as ebonite or varnished glass, are set co-axially very close together, and supported on horizontal spindles which have opposite direction of rotation. Each disc has pasted on the outside a large number of segments of tinfoil. On each side of the

pair of discs there is fixed a metal bar diametrically across, and provided at its two ends with fine wire brushes just touching the row of sectors as they sweep by when the disc revolves. These two metal bars are set with an inclination of about 45 degrees to the horizontal, but not in the same direction, so that the angle they include is about