| Year | 1939 |
| Date | 06-Apr |
| Volume | 80 |
| Issue | 1,978 |
| Page | 408 |
| Category | Petrol Engine Topics |
| Part | |
| Title | Notes on Miniature Sparking Plugs |
| Author | Edgar T.Westbury |
| Notes | Sealing the insulator to the body, protection of manufacturing rights, some examples of successful miniature pligs, by R.Trevithick, plug with lead-in wire and glass sleeve by Ian Bradley, fitted to engine |