| Year | 1920 |
| Date | 04-Mar |
| Volume | 42 |
| Issue | 984 |
| Page | 219 |
| Category | Workshop |
| Part | |
| Title | Phantom or Spectral Wheels |
| Author | V.E.Johnson |
| Notes | A Workshop Phenomenon. First apparatus, relative speeds by friction cog wheels, another apparatus, results of rotating, disc patterns used, suggested practical applications |