| Year | 2023 |
| Date | 16-Jun |
| Volume | 231 |
| Issue | 4,719 |
| Page | 26 |
| Category | Steam |
| Part | 2 |
| Title | Radial Valve Gears Again |
| Author | Duncan Webster |
| Notes | Stephenson's (1). Sheds light on what is often seen as a complex subject. Reversible gear, Stephenson's Gear, launch links, increase in lead at mid gear - launch links, equal leads - launch links, references |