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).
Plan view diagram illustrating an oil pump connected to a piston and motor cylinder for reverse torque.
| Identifier | Morton\M2.1\ img004 | |
| Date | 27th April 1918 | |
| OIL PUMP IS SHOWN CONNECTED ONLY PER PISTON TEST & HALF DUTY CRANK TEST SEE MEMO ATTACHED ORDINARY MOTOR CYLINDER FOR REVERSE TORQUE PLAN HOLES THROUGH PISTON TO CROWN TO GET PRESSURE UNDER ANNULUS OF THE CROWN E/6267/18 CEB 27/4/18 | ||