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).
Extract concerning American Bosch ignition on 4EX, specifically the durability of platinum iridium points.
| Identifier | ExFiles\Box 35\6\ scan 056 | |
| Date | 4th August 1921 | |
| X 2894 M.S. Bks/100 (T) (S.H. 798, 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2948 Extract from Oy8-G 4.8.21 X.4275. RE AMERICAN BOSCH IGNITION on 4EX. X.1818. (2) PLATINUM IRIDIUM POINTS IN CONTACT BREAKER: X.186 X.2894. The American Bosch Co. when approached on this point state that they consider platinum iridium points would be more durable than tungsten. We are therefore writing them for a quotation. | ||