belt of silk runs over two metal pulleys, one of which is surrounded by a
hollow metal sphere. Two electrodes, in the form of comb-shaped rows of
sharp metal points, are positioned respectively near to the bottom of the
lower pulley and inside the sphere, over the upper pulley. The top electrode
is connected to the sphere and the bottom one to the ground. A high DC
potential is applied to the upper pulley. A simple version of which
equipment is being described here?
hollow metal sphere. Two electrodes, in the form of comb-shaped rows of
sharp metal points, are positioned respectively near to the bottom of the
lower pulley and inside the sphere, over the upper pulley. The top electrode
is connected to the sphere and the bottom one to the ground. A high DC
potential is applied to the upper pulley. A simple version of which
equipment is being described here?