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).
Specifications for the armature taper dimensions on the J. motor for chassis 14-EX.
| Identifier | ExFiles\Box 64\2\ scan0117 | |
| Date | 27th August 1927 | |
| Y7625B EFC/T27.8.27. X.7625B. X.7655B. The armature taper on the J.{Mr Johnson W.M.} motor fitted to chassis 14-EX. is such that its diameters at the two ends are 3.100" and 3.004". EFC. | ||