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).
Drawing showing the standard heights for jacks for a 20 HP chassis.
| Identifier | ExFiles\Box 26\6\ Scan008 | |
| Date | 25th September 1924 guessed | |
| 20 H.P. CHASSIS. STANDARD HEIGHTS FOR JACKS. FRONT AND REAR AXLES. 7.5" 12" X4080 BAP. | ||