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).
The Eisemann Type G.N.6 magneto, comparing its weight and design features to other models.
| Identifier | WestWitteringFiles\E\November1920\ Scan43 | |
| Date | 10th November 1920 | |
| To R.{Sir Henry Royce} from EFC. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to PN.{Mr Northey} c. to Bn.{W.O. Bentley / Mr Barrington} c. to By.{R.W. Bailey - Chief Engineer} c. to EWT. for R.R.Inc. ORIGINAL. X.179 - EISEMANN TYPE G.N.6 MAGNETO. The weight of this magneto is 16.9 lbs. The weight of the standard Watford type E.6 is 11.7 lbs.; that of the new Watford type E.O.6 is 12.7 lbs, that of the German Bosch type Z.R.6 is 18.25 lbs. and the American Bosch Z.R.6 is 15.1 lbs., the above weights being without driving drum or pulley. The Eisemann magneto appears to be generally a satisfactory job. The high tension distributor is on different lines from the standard in which a revolving brush runs over fixed segments. In this case we have a radial revolving segment embedded in the flat face of an insulating disc revolving in contact with a central carbon brush and in successive contact with six carbon brushes, corresponding to the six distributor terminals. We doubt whether this type of distributor has any advantage as regards tracking, etc. over the ordinary type distributor, unless it be in the fact that any carbon dust which is formed is removed from the surface by centrifugal force.. It appears, however, to give quite a neat result. It perhaps also has a slight advantage in the fact that the pressure of the carbon brush is not increased by centrifugal force. The contact breaker is very much on the usual Bosch lines, grey fibre block being used in contact with the cams. Contd. | ||