Instruction sheet containing a table of make ratios and distribution sums for various magneto types.
| Identifier | ExFiles\Box 4\5\ 05-page210 | |
| Date | 17th June 1921 | |
| RR.210.(250 Bks.) (P.173. &. Co. Ltd.) P.D.P. 18/5/20 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E.F.C. Order No: P.B.7. Customer's No: X.430 Table of Magneto Make Ratios, Etc. Magneto. | Type. | Make Ratio. | Distribution sum of make & break verifying | Distribution sum of make & break and switch verifying Watford | E.6 | a) .860 | 77.5 | 78.4 " | E.O.6 | a) .960 b) .888. | 77.8 | 78.7 R. {Sir Henry Royce} Bosch | Z.R.6. | .458 | 77.0 | 77.5 USH Bosch | Z.R.6. | .850 | 83.8 | 84.6 " | B.6. | .864 | 39.6 | 40.5 " | D.U.Z.6 | .870 | 80.9 | 81.8 Conner | C.M.I | .433 | 71.8 | 72.2 B.T.H. | F.M.6 | .556 | 51.2 | 51.8 Eisemann | G.N.8. | .841 | 73.1 | 73.9 Dixie | Aero. 64 S. | .407 | 71.6 | 72.0 Signed: C.H.P. This Sheet must be filed on completion of the work. | ||
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).