| Year | 2001 |
| Date | 06-Apr |
| Volume | 186 |
| Issue | 4,143 |
| Page | 322 |
| Category | Boiler |
| Part | 1 |
| Title | Capacity of Safety Valves for Model Steam Engines |
| Author | Paul Horth |
| Notes | Demonstrates some surprising effects. CAD by D.A.G.Brown. Background, full-size practice, model valves, when a valve opens, critical flow, equations for valve capacity, flow through the valve cap, force balance on the valve |