| Year | 1985 |
| Date | 05-Jul |
| Volume | 155 |
| Issue | 3,756 |
| Page | 22 |
| Category | Stationary Engine |
| Part | 10 |
| Title | Princess Royal & Goliath. Variants on Mid-Nineteenth Century Mill Engines |
| Author | Tubal Cain |
| Notes | Governor valves, valve body, valve disc, bell crank and pivot, governor end lever, linkwork |