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 engineering specifications and modifications, page 2.
| Identifier | ExFiles\Box 19\2\ Scan075 | |
| Date | 24th February 1917 | |
| R.R. 235 A (770 H) S.D 442. 24-2-17; G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1965 -2-. 14. Self Starter six volts (afterwards changed to 12 volts.) 15. Lucas Dynamo to generate sufficient current for the lamp at 15 m.p.h. Belt pulley ratio not less than 1.5 to 1. 16. Single push button switch for starter. 17. Stronger valve springs. 18. Slower moving air valve. 19. Air pump on gowenor case. 20. Ferodo for side brakes. 21. Instruction Board to be fitted similar to 49.CB. 22. Speedometer, this is to be driven by a raw hide belt sewn joint. A special pulley made by R.R. non-adjustable. 23. Oil retaining ring to clutch. EH. | ||