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).
Instruction sheet detailing the number of earthing brushes on different magneto models.
| Identifier | ExFiles\Box 4\5\ 05-page145 | |
| Date | 2nd February 1921 | |
| R.R.360 (1000) (SF 349 26.1.18.) PEP 20552 X.430 91284 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No PA.{Mr Paterson} 63. Customer's No. Re X. 430. Earthing brushes on diff. Magnetos Machine | Brush behind breaker | Brushes through frame | Total number of brushes Watford B.6. | 1 | 2 | 3 " E.6. | 1 | 2 | 3 " E.O.6. | 1 | 1 | 2 Bosch Z.R.6. | 1 | 2 | 3 U.S.A. Bosch Z.R.6. | 1 | 1 | 2 " " B.6 | 1 | 0 | 1 Dixie Aero. 6AS | 0 | 0 | 0 Eisemann. G.N.6. | 1 | 1 | 2 Conner. C.M.I. | 1 | 0 | 1 Berling. F.61. | 1 | 0 | 1 " E.61. | 1 | 0 | 1 " D.63. | 1 | 0 | 1 U.S.A. Bosch D.U.Z.6 | 1 | 1 | 2 Signed C.A.P. This Sheet must be filed on completion of the work | ||