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 efficiency and depreciation of magnetism in Watford Magnetos, types E06 and R01.
| Identifier | ExFiles\Box 48\2\ Scan376 | |
| Date | 30th April 1928 | |
| EFC {E. Fowler Clarke - Electrical Engineer} X8796 Mx {John H Maddocks - Chief Proving Officer} 10/T30.4.28. X7791 X579 X8796 WATFORD MAGNETOS TYPES E06 and R01. In reply to your EFC {E. Fowler Clarke - Electrical Engineer} 3/T28.4.28, we have not up to the present any means of determining whether there is any depreciation of magnetism, as suggested by you, but we do feel that the efficiency of magnetos deteriorates, as we frequently find that after a certain amount of running, the magnetos give poor results, and will not then attain the standard of the initial test. | ||