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 experimental parts fitted to chassis 6.EX.
| Identifier | ExFiles\Box 158\4\ scan0010 | |
| Date | 22th June 1920 | |
| X.3433 Extract from RHC{R. H. Coverley - Production Engineer}1/LG22.6.20. RE CHASSIS 6.EX. Will you kindly note that the above car has been fitted with the following experimental parts:- X.3733. - Pinned Valve Tappes - N.2696. X.3699. - Magneto Fabric Coupling. - N.4683. X.3630. - Magneto on Sloping Base - N.3031. X.3473. - Altered position of Oil Jet to Wheelcase - N.4247. Pistons - 6 ring type E.18470 X.3713c. - Coil with square base fixed to Distributor Arm. X.3563. - Thermostat Control N.2641. | ||