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).
Note regarding ammeter overload testing.
| Identifier | ExFiles\Box 168\5\ img152 | |
| Date | 28th March 1929 | |
| EP{G. Eric Platford - Chief Quality Engineer}/Thn. from EFC V11ba EFC2/T28.3.29. AMMETERS With further reference to LE7/H26.3.29. and your request for further information, the ammeter will safely stand a current of 40 amperes, i.e. 100% overload for half a minute without shewing any sign at the time or subsequently of being injured. In order definitely to ascertain this, we have made the necessary tests. EFC. | ||