| Year | 2021 |
| Date | 16-Jul |
| Volume | 227 |
| Issue | 4,669 |
| Page | 759 |
| Category | Stationary Engine |
| Part | 1 |
| Title | A K.N.Harris Oscillating Engine |
| Author | Geoff Walker |
| Notes | Builds a simple oscillating engine designed and described by K.N.Harris 75 years ago. Introduction, the basics, the standard |