| Year | 1999 |
| Date | 07-May |
| Volume | 182 |
| Issue | 4,093 |
| Page | 571 |
| Category | Stationary Engine |
| Part | 4 |
| Title | Experiments With Valve Gears |
| Author | David Bull |
| Notes | Hypothetical indicator diagram, effect of steam conditions on equations, thermal efficiencies with variable cut off |