| Year | 1979 |
| Date | 18-May |
| Volume | 145 |
| Issue | 3,609 |
| Page | 590 |
| Category | Nautical |
| Part | |
| Title | Some notes on a full size compound launch engine |
| Author | A.A.Leak |
| Notes | "Archimedes", William Joest (1841) fishtail action, Elijah Galloway's design, 1824 Bennett Woodcroft variable pitch, Charles Firret's 1845 patent, Thomas Parlour (1845), 1846 design by James Montgomery, 1848 feathering prop by Joseph Maudsley |