| Year | 1941 |
| Date | 29-May |
| Volume | 84 |
| Issue | 2,090 |
| Page | 436 |
| Category | Improving the Two-Stroke |
| Part | |
| Title | "Valves for the Valveless!" |
| Author | Edgar T.Westbury |
| Notes | Rotary admission valves, limitations of cylindrical rotary valves, conical and disc rotary valves |