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 outlining a list of twelve design features for a mechanical component.
| Identifier | Morton\M19\ img277 | |
| Date | 12th November 1931 guessed | |
| 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 MAXIMUM RESERVE FOR MINIMUM HEIGHT 10 GREATER MAIN BEARING AREA 11 CASE HELD TO FRAME BY TWO BOLTS ONLY 12 LESS OVERALL DIMENSIONS | ||