| Year | 1939 |
| Date | 23-Mar |
| Volume | 80 |
| Issue | 1,976 |
| Page | 352 |
| Category | Petrol Engine Topics |
| Part | |
| Title | Notes on Miniature Sparking Plugs |
| Author | Edgar T.Westbury |
| Notes | Bosch, Champion, Hurleyman, Brown Junior, early Champion, special quartz-insulator, loaned by R.Trevithick, experimental plug |