| Year | 2018 |
| Date | 22-Jun |
| Volume | 221 |
| Issue | 4,589 |
| Page | 21 |
| Category | Boiler |
| Part | 3 |
| Title | Designing Model Boilers Or, The Truth About Model Boilers |
| Author | Martin Johnson |
| Notes | Explains what really happens inside model boilers. Grate loading, coal lost before combustion, air ratio, other 'constants', references |