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 questioning why English makers cannot produce porcelain ignition plugs equal to Champion for aero engines.
| Identifier | ExFiles\Box 33\3\ Scan259 | |
| Date | 28th November 1927 | |
| X14120. Extract from R3/M28.11.27. What is stopping English makers from making porcelain ignition plugs equal to Champion, as we understand these are superior to anything on aero engines - i.e. most trying conditions. | ||