| Year | 1968 |
| Date | 16-Feb |
| Volume | 134 |
| Issue | 3,339 |
| Page | 180 |
| Category | Aeronautical |
| Part | 4 |
| Title | Early Aircraft Engines |
| Author | Edgar T.Westbury |
| Notes | Ellehammer six-cylinder radial, Gnome Monosoupape fourteen-cylinder, Clerget seven-cylinder, photographs by R.Moulton of Aeromodeller |