| Year | 1934 |
| Date | 22-Mar |
| Volume | 70 |
| Issue | 1,715 |
| Page | 279 |
| Category | Steam |
| Part | |
| Title | Valve Diagrams Applied to Model Steam Engines |
| Author | D.C.Jeffrey |
| Notes | The "Stuart "Sun" piston valve, valve diagram for the "Sun" engine, improved valve setting for an engine with separate steam and exhaust valves |