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).
The effect of an auxiliary external gap in enhancing sparking at the main gap under adverse conditions.
| Identifier | ExFiles\Box 37\1\ scan 091 | |
| Date | 1st January 1921 | |
| X.3199 To R.{Sir Henry Royce} from EFC. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to PN.{Mr Northey} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Hy.{Tom Haldenby - Plant Engineer} c. to EWT. for R.R. Inc. X.3199. - BATTERY IGNITION - GENERAL EFFECT OF AUXILIARY GAP IN ENHANCING SPARKING AT THE MAIN GAP UNDER ADVERSE CONDITIONS. Attached please find copy of my assistant's report on the above, carried out in connection with the R.R. standard battery ignition on the bench. It will be seen that the effect of an auxiliary external gap in improving sparking at the main gap under leaky main gap conditions is considerable. Another notable instance of this was the following :- Owing to lack of ebonite for the purpose, a set of test gaps was made up for us on a slate base, but we found this to be quite useless for its purpose and only quite short sparks (about 2mm.) could be made to pass over the gaps due to the partial conduction of the slate. If, however, a properly insulated external gap were put in series with one of the gaps on the slate base, much longer sparks (about 5mm.) could be obtained on those partially insulated gaps. EFC. | ||