| Year | 2023 |
| Date | 11-Aug |
| Volume | 231 |
| Issue | 4,723 |
| Page | 278 |
| Category | Steam |
| Part | 6 |
| Title | Radial Valve Gears Again |
| Author | Duncan Webster |
| Notes | Straight Slide Error and Correction. Sheds light on what is often seen as a complex subject. Straight slide error, curved slide error, the Greenly correction, Jack Buckler's 'Jacob's Ladder' linkage, geometry of the 'Jacob's Ladder' linkage, Scott Russell mechanism, straight line mechanisms, James Watt '#1' linkage, variation of Watt '#1', James Watt '#2' linkage, Watt #1, Watt #2 |