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).
Specification of the armature taper diameters for the J. motor fitted to chassis 14-EX.
| Identifier | ExFiles\Box 64\4\ scan0044 | |
| Date | 27th August 1927 | |
| X.7655B. 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. | ||