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).
Effect of an auxiliary external gap on improving sparking in battery ignition systems under adverse conditions.
| Identifier | WestWitteringFiles\F\January1921\ Scan12 | |
| Date | 7th January 1921 | |
| 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 By.{R.W. Bailey - Chief Engineer} c. to EWT. for R.{Sir Henry Royce} R.{Sir Henry Royce} Inc. ORIGINAL. EFC7/T7.1.21. 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 2 mm.) 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 5 mm.) could be obtained on those partially insulated gaps. EFC. | ||