| Year | 1941 |
| Date | 12-Jun |
| Volume | 84 |
| Issue | 2,092 |
| Page | 467 |
| Category | Improving the Two-Stroke |
| Part | |
| Title | "Valves for the Valveless (Valves in two-stroke engines) |
| Author | Edgar T.Westbury |
| Notes | Rotary valves and pumping efficiency, proposed rotary disc valve arrangement by Ian Bradley, rotary valve with variable timing, induction passages, "conversion attachment" applied to the 15 c.c. "Atom Minor" engine, lubrication of rotary-valve engines |