| Year | 1997 |
| Date | 26-Sep |
| Volume | 179 |
| Issue | 4,051 |
| Page | 390 |
| Category | Workshop |
| Part | 1 |
| Title | The Design of Epicyclic or Planetary Gearing |
| Author | Len Snell |
| Notes | Discusses the ramifications. Introduction, vector analogy, epicyclic or planetary gearing - definition, the differential |