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 materials and performance of B.T.H. and Watford magnetos, particularly concerning the H.T. collector.
| Identifier | ExFiles\Box 48\2\ Scan329 | |
| Date | 26th November 1925 | |
| Contd. -2- EFC {E. Fowler Clarke - Electrical Engineer} 3/T26.11.25. noise from these B.T.H. magnetos, even than with the latest type of Watford magneto with better located sleeve. We therefore suggest this point for the consideration of Messrs. North, the B.T.H. magneto being also a sleeve machine. Further to our EFC {E. Fowler Clarke - Electrical Engineer} 3/T16.11.25 and our subsequent conversation with regard to the H.T. collector on the Watford magneto, we have ascertained from the laboratory that the H.T. collector taken off one of the most recent machines with the new and better location of sleeve, which machine was removed from one of our experimental cars, consists of a phenol moulding and not a rubber base material, so it appears that your impression that these were made of ebonite, will not be correct. EFC. {E. Fowler Clarke - Electrical Engineer} | ||