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 sheet and photographs for a Lodge 741 spark plug.
| Identifier | ExFiles\Box 162\2\ img007 | |
| Date | 23th February 1940 guessed | |
| LODGE 741 REACH - 0.75" LENGTH OF BARREL - 0.937" LENGTH OF INSULATOR - 2.250" INSULATOR MATERIAL - SINTOX REMARKS: COOLER PLUG THAN FORMER LODGE TESTED FOR TRIAL ON B60 & B80. | ||