| Year | 1956 |
| Date | 31-May |
| Volume | 114 |
| Issue | 2,871 |
| Page | 894 |
| Category | Internal Combustion |
| Part | |
| Title | Differentials to Desmodromics |
| Author | Edgar T.Westbury |
| Notes | Operation of i.c. engine valves. Disadvantages of the system, section of Gnome monosoupape engine, Bristol radial engine, "see-saw" valve gears, positive action valve gears |