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).
List of parts and specifications for a Servo system.
| Identifier | ExFiles\Box 94\1\ scan0139 | |
| Date | 7th June 1935 | |
| -3- HS{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}11/KW.7.6.35. Servo. Large dia. servo to N.Sch.4283, 4327. Friction lining G.82827. Friction plate G.82828. Pressure plate G.82829. 35º cams G.82796/7. Swinging arm to have the friction disc type damper. HS{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||