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).
Numbered list detailing modifications and tests on ignition system components.
| Identifier | ExFiles\Box 61b\1\ scan0057 | |
| Date | 17th September 1928 guessed | |
| -2- Contd. ✓ { (27d) Scrubbing action for existing parts, with improved alternative springing to LeC.2460. (28) E.J.B's reduced core coil. ✓ (28a) Old standard coil with double ballast. ✓ (29) Insulated lever, earthed point. ✓ (30) Remy lever on RR. breaker. ✓ (31) Remy with misaligned screw point. ✓ (32) (27b) scrubber with mushroom type rotor. ✓ (33) Improved alternative springing (Incorporated in (27c) and(27d) ). ✓ (34) Thinner scrubbing arm. ✓ (35) Gold-silver contact points. ✓ (36) Life test of tungsten points. ✓ (37) Remy combination. ✓ (38) No distributor, scrubbing action and quicker break cam. ✓ (39) Scrubbing action without distributor. 1+2 ✓ (40) " " with quicker break cam. 2+4 ✓ (41) Bosch central H.T. coil on old standard make and break ✓ (42) D-R.{Sir Henry Royce} nearly close circuit HT coil ditto. EFC. | ||