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).
Description of an addition to a diagram showing ammeter connections.
| Identifier | ExFiles\Box 172\3\ img026 | |
| Date | 10th June 1920 guessed | |
| X.3792. -2- and on to ammeter. Addition to inside of cover of box of diagram showing connections to and from the box. | ||