| Year | 1953 |
| Date | 26-Nov |
| Volume | 109 |
| Issue | 2,740 |
| Page | 640 |
| Category | Talking about Steam- |
| Part | 22 |
| Title | Expansion Valve Gears |
| Author | W.J.Hughes |
| Notes | Variable expansion, expansion valve gears (as fitted to early and later side-lever marine engines), an early marine expansion engine, the "Wallis" expansion gear, as fitted to Wallis and Steevens traction-engines |