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).
Test results for a Magneto type E.R.6, showing utility values in Micromhos with various cams.
| Identifier | ExFiles\Box 40\2\ Scan103 | |
| Date | 12th April 1926 | |
| Messrs. Rolls Royce Ltd., Derby. April 12th.1926. Test of Magneto type E.R.6. No.51 A.{Mr Adams} sent to Messrs Rolls Royce Ltd. 1. Magneto fitted with Magnet of 10 m/m thickness. Utility Values in Micromhos with various Cams. Cam. Angle of Make - 84º Angle of Break - 96º Timing Position. 500 r.p.m. 700 2100 3000. Adv: 2.22 2.44 3.22 2.94. Ret: 30º 3.30. 3.84. 5.0. 5.0. " 60º 5.25. 6.25. 9.1. 12.5. Cam. Angle of Make - 90º Angle of Break - 90º Timing Position. 500 r.p.m. 700. 2100 3000. Adv: 2.0 2.74 3.0 2.64. Ret: 30º 3.3 3.85 5.25. 5.9. " 60º 4.75 6.25 11.2 12.5. Cam. Angle of Make - 110º Angle of Break - 70º Timing Position 500 r.p.m. 700. 2100 3000. Adv: 2.78 2.85 2.38 2.38. Ret: 30º 3.45 4.0 5.25. 4.0. " 60º 5.55 5.86 9.1. 11.2. | ||