| Year | 1961 |
| Date | 15-Jun |
| Volume | 124 |
| Issue | 3,127 |
| Page | 750 |
| Category | Nautical |
| Part | |
| Title | Built Beside the Thames. Marine Engines from Maudslay and John Penn |
| Author | George Woodcock |
| Notes | Side-lever of about 1830, Maudslays' Siamese of 1839, John Penn's oscillating engine of 1845 |