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).
Specification and photographic comparison of Champion NA 8 and LB 8 spark plugs.
| Identifier | ExFiles\Box 162\2\ img009 | |
| Date | 23th February 1940 guessed | |
| CHAMPION NA{Mr Nadin} 8 REACH: .900" LENGTH OF BARREL: .850" LENGTH OF INSULATOR: 2.200" INSULATOR MATERIAL: SILLIMANITE REMARKS: OBTAINED FOR TEST ON PH. III CHAMPION L B 8. REACH: .600" LENGTH OF BARREL: 1.150" LENGTH OF INSULATOR: 2.350" INSULATOR MATERIAL: SILLIMANITE REMARKS: OBTAINED FOR TEST ON 25/30 & BENTLEY | ||