From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint drawing showing multiple views and a cross-section of a mechanical component, with a handwritten list of its features.
| Identifier | ExFiles\Box 56\1\ Scan047 | |
| Date | 28th October 1931 | |
| Features. 1. All valve seats horizontal 2. Valves accessible. 3. Minimum amount of drilling Maximum simplicity of holes 4. Valve chambers vent one into the other and into main chamber, hence by groove in piston to atmosphere. 5. Split-piston ensures silence 6. Main lever pressed on. 7. No studs for valve chamber. Simple screw plug for seal. 8. No filter. 9. Oil reservoir contains max reserve oil for minimum height 10. Greater main bearing area 11. Case held to frame by two bolts only MAX REBOUND MAX BUMP SECTION XY Heale | ||