1.Induction motor: It is an experimental device that can continuously obtain and accumulate more positive and negative charges. The voltage generated by the induction motor is higher. After being combined with other instruments, it can be used for electrostatic induction, lightning simulation experiments and demonstration of tip discharge. 2.Experimental equipment: the electric power line of the electrostatic field, the tip discharge and the discharge experiment of the vacuum tube (part of the Geisler tube or Crookes tube) 3.Conductive layer: It is coated with an electric material, the coating is firm, and the life is long. It overcomes the shortcomings of the original aluminum foil that is easy to fall off and can improve the electrification performance. It can still maintain good performance in humid climates and rainy days. Electric effect. 4.Applicable to: It is used to generate electrostatic high voltage in the experiment, and cooperate with other instruments to carry out the charge distribution on the surface of the conductor.