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).
Blueprint of a steering cam for a 1:500 gear with 4.1 left-hand turns.
| Identifier | ExFiles\Box 153\1\ scan0030 | |
| Date | 31th August 1937 guessed | |
| 1.168 +0.002 -0.002 1.100 +0.005 -0.005 2.385 DIA. +0.005 -0.005 0.020 R 84° STOP TO STOP STEERING CAM - 1:500 GEAR. 4.1 TURNS L.H SCALE 2/1 | ||