| Year | 1960 |
| Date | 04-Feb |
| Volume | 122 |
| Issue | 3,056 |
| Page | 136 |
| Category | Internal Combustion |
| Part | |
| Title | Unorthodox I.C. Engines. Rotary and Sleeve Valve types |
| Author | Edgar T.Westbury |
| Notes | Positive operation, early Crossley vertical gas engine, Darracq rotary valve engine, small Aspin engine, Cross rotary valve, two-stroke admission valves, characteristics, other sleeve valves |