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).
Extract listing experimental parts fitted to 40/50 chassis models.
| Identifier | ExFiles\Box 41\1\ Scan082 | |
| Date | 15th April 1920 | |
| X 3777 Extract from RHC{R. H. Coverley - Production Engineer}1/LG15.4.20. We give below a list of experimental parts which have been finished. X.3764. 40/50 CHASSIS. X. No. | Parts fitted. | Engine. --- | --- | --- 3733. | Pinned Valve Tappets. | Fitted to chassis 4.EX. 3777. | Double Valve springs. | Fitted to chassis 4.EX. 3563. | Ignition tube bracket in conn: with Thermostat Control. | Fitted to 49-GB. 3456. | Mascot for Radiator. One rec: from outside passed to Hs.{Lord Ernest Hives - Chair} | 3476. | Leather stockings. | Fitted to 4.EX. | ||