| Year | 1934 |
| Date | 25-Jan |
| Volume | 70 |
| Issue | 1,707 |
| Page | 95 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | Balanced Slide Valves |
| Author | H.S.Gowan |
| Notes | Principle as adapted for use on model locomotives, the "Richardson" strip-packing system of slide valve balancing |