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).
Table of resistances and corresponding lengths for a two-rate charge scheme.
| Identifier | ExFiles\Box 163\6\ img139 | |
| Date | 7th February 1931 | |
| X. 6016 7.2.31. X.6016. RESISTANCES FOR TWO-RATE CHARGE SCHEME. Length (inches) Resistance (ohms) 40 3.0 32 2.4 24 1.8 16 1.2 6 .45 Peak ampere output reduction is approximately 1/5 of the inches of resistance. EFC. | ||