| Year | 1979 |
| Date | 04-May |
| Volume | 145 |
| Issue | 3,608 |
| Page | 519 |
| Category | Stationary Engine |
| Part | 13 |
| Title | The Piston Drop Valve Engine |
| Author | A.Haworth |
| Notes | Main and extension bedplate, extension bed for tail-slide, plant arrangement of engines and boilers, crankpin oiling |