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).
The standardization of Ferranti ammeters pending a 10,000-mile test.
| Identifier | ExFiles\Box 168\5\ img274 | |
| Date | 30th January 1934 | |
| Roy.{Sir Henry Royce} From Ha/Wst. Ha/Wst.4/MA.30.1.34. Re. FERRANTI AMMETERS. Referring to your Roy{Sir Henry Royce}/MS.2/P.29.1.34., we have no prospect of standardising the above ammeters for either of the chassis mentioned until two or three months have elapsed when we shall have had more experience of this ammeter on the 10,000 miles test. Ha/Wst. | ||