| Year | 2001 |
| Date | 04-May |
| Volume | 186 |
| Issue | 4,145 |
| Page | 432 |
| Category | Boiler |
| Part | 2 |
| Title | Capacity of Safety Valves for Model Steam Engines |
| Author | Paul Horth |
| Notes | Demonstrates some surprising effects. Solving for the back pressure, valve capacity, worked example, how to increase capacity, discussion, sources of error, what capacity do we need? Spreadsheet |