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).
Blueprint comparing primary current curves for Wraith ignition systems from Rolls-Royce and Delco-Remy distributors.
| Identifier | ExFiles\Box 168\3\ img152 | |
| Date | 5th April 1939 | |
| W Ch. 5 WRAITH IGNITION PRIMARY CURRENT CURVES Rolls Royce DISTRIBUTOR 650 R.P.M. AMPS 2 1 0 Delco - Remy 650 R.P.M. AMPS 2 1 0 Rolls Royce DISTRIBUTOR 1400 R.P.M. Delco - Remy 1400 R.P.M. S.G.L 5.4.39 | ||