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).
Cross-reference note for previous correspondence regarding a 40/50 N.B. dynamo.
| Identifier | ExFiles\Box 60\1\ Scan001 | |
| Date | 14th August 1925 guessed | |
| X.7660 For previous correspondence re 40/50 N.B. dynamo with 28 slot armature; see X.8672 . | ||