| Year | 2021 |
| Date | 26-Feb |
| Volume | 226 |
| Issue | 4,659 |
| Page | 338 |
| Category | Historic |
| Part | 18 |
| Title | The Stationary Steam Engine |
| Author | Ron Fitzgerald |
| Notes | The Double Acting Steam Engine. Takes a look at the history and development of the stationary steam engine. Early drawing, Watt's use of a toothed rack, Cotes and Jarrett's engine, James Watt's sketch of the first version of the Parallel Motion, Stonard and Curtis Engine with three bar parallel motion, reference |