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).
From the Test Department regarding the receipt of three modified dynamos.
| Identifier | ExFiles\Box 165\6\ img138 | |
| Date | 29th March 1927 | |
| V5660 EFC. 29.3.27. Please receive three dynamos D.W.65.M. } 40/50 HP. F.U.65.M. } I.2.R.M. 20 HP. each with single modification. J.Daykin (Test Dept.) | ||