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).
Graph showing side steering tube characteristics.
| Identifier | ExFiles\Box 95\1\ scan0302 | |
| Date | 9th January 1936 | |
| SIDE STEERING TUBE CHARACTERISTICS. SPRING LOAD lbs 400 300 200 100 MOVEMENT FROM CENTRAL POSITION 0.050 0.100 0.150 0.200 0.250 0.300 0.350 0.400 MARLES ON 25 HP BENTLEY STD. Ph III STD. 25 HP 36 Ex (23/4/36) DOTTED LINE SHOWS CONDITION ON 33 EX. 77H / 9/1/36 | ||