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 depreciation of magnetism in Watford Magnetos, types EC6 and H01.
| Identifier | ExFiles\Box 57\2\ Scan202 | |
| Date | 30th April 1928 | |
| EFC. X5790 Mx{John H Maddocks - Chief Proving Officer}10/T30.4.28. WATFORD MAGNETOS TYPES EC6 AND H01 X.7791 X.8796 X.5790 In reply to your EFC3/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. Mx.{John H Maddocks - Chief Proving Officer} | ||