| Year | 1936 |
| Date | 08-Oct |
| Volume | 75 |
| Issue | 1,848 |
| Page | 346 |
| Category | Lessons in Model Machine Shop Practice |
| Part | 9 |
| Title | "Grayspec" Petrol Engine |
| Author | |
| Notes | Water-cooled cylinder, saddle boring, chuck boring, cutting the internal thread, water jacket cover |