| Year | 2003 |
| Date | 24-Jan |
| Volume | 190 |
| Issue | 4,187 |
| Page | 71 |
| Category | Steam |
| Part | |
| Title | The Steam Engine Indicator |
| Author | J.F.Willock |
| Notes | Exploration of origin, types and uses. Watt's indicator, Southern' indicator, McNaught's indicator, Richard's patent indicator, Thompson's indicator, the Dobbie-McInnes indicator, taking a diagram, references |