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 test progress for a Ferranti ammeter instrument for a chassis.
| Identifier | ExFiles\Box 168\5\ img141 | |
| Date | 4th September 1928 | |
| EPC. V5403 ROY{Sir Henry Royce}/GEA3/EB4.9.28. Ammeters for Chassis. Referring to your memo ref: EPC5/T28.8.28, reporting on the Park Royal Ammeter type MC.2F No.49842. Will you kindly let us know how the tests are proceeding with the Ferranti instrument you are testing? ROY.{Sir Henry Royce} | ||