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).
Title page for the ammeter section.
| Identifier | ExFiles\Box 47\4\ Scan019 | |
| Date | 16th December 1925 guessed | |
| AMMETER. -------- | ||