| Year | 1961 |
| Date | 29-Jun |
| Volume | 124 |
| Issue | 3,129 |
| Page | 802 |
| Category | Nautical |
| Part | 2 |
| Title | Built Beside the Thames. Marine Engines from Maudslay and John Penn |
| Author | George Woodcock |
| Notes | Buses on the River. Penn's trunk screw engine, Thames Ironworks diagonal compound, bibliography |