| Year | 1997 |
| Date | 05-Dec |
| Volume | 179 |
| Issue | 4,056 |
| Page | 669 |
| Category | Steam |
| Part | 3 |
| Title | Radial Valve Gears Revisited |
| Author | Duncan Webster |
| Notes | Explores outside Joy, Chas. Brown's and Heywood gears. Design methodology, worked example, offset top joint, Heywood's gear, design differences, more workings |