| 摘要 |
PURPOSE:To prevent a copper disc from polarizing by opening several holes of suitable size near the outside of the disc, and operating a vertical magnetic field to the disc. CONSTITUTION:Several holes 2 are opened at the outside of a copper disc 1, and a magnetic field is vertically operated, and even if the disc 1 is rotated at a high speed, the disc 1 is prevented from polarizing, thereby facilitating the generation of a current. |
