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).
Failure of fibre bushes in Bosch magneto contact breakers during a 10,000-mile engine bench test.
| Identifier | ExFiles\Box 4\5\ 05-page048 | |
| Date | 27th August 1914 | |
| Wor{Arthur Wormald - General Works Manager}/EHS/027814. Re Fibre Bushes for Contact Breakers. X 420 J.{Mr Johnson W.M.} 27-8-14. R.{Sir Henry Royce} In reply to Mr Royce's note E1/E19814 I should like to point out that on the 10,000 mile engine bench test, two Bosch magneto contact breakers were so badly that they had to be renewed. In both cases it was the pivot with the fibre bush that gave out, in one case the pin seized in the bush and broke off, in the other case the fibre bush disappeared altogether, whether it had worn away or become loose and dropped out I could not say. It was this result, in comparison with the excellent way our standard contact breaker stood up that made me condemn the fibre bushes. I have never heard of a case where our contact breaker has failed altogether, but that is what happened to the Bosch on the bench test. | ||