| Year | 2012 |
| Date | 01-Jun |
| Volume | 208 |
| Issue | 4,431 |
| Page | 770 |
| Category | Portable Engine |
| Part | |
| Title | Potable (Portable?) Engine corrections and omissions (A 1:6 Scale Barrett, Exall and Andrewes Portable Engine) |
| Author | Tony Webster |
| Notes | Slide bar drawing, the valve chest, saddle and cylinder |