caption: The image shows a drawing of a machine with a pendulum and a ball on it, along with some text which reads "electrostatic generator". The machine is composed of several components, including a motor, a coil, and several balls, all connected by a series of wires. The text is written in a bold font and is surrounded by a decorative border. The colors used in the drawing are mostly shades of blue and green, giving the image a calming and peaceful atmosphere.