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).
Report page on ignition performance testing with different ballast resistances at various voltages.
| Identifier | ExFiles\Box 54\5\ Scan315 | |
| Date | 9th December 1924 | |
| R.R. 238 (150 BKS.) (DB {Donald Bastow - Suspensions} 461-9.12.24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. (2) To_____________________19__ Order No. WD {Mr Wood / Mr Whitehead} 48 Customer's No. __________ were experienced on the "pick up" but otherwise the ignition was perfectly OK. A 1 1/2 ballast also was tried and it was felt that with this combination there was a good margin of satisfactory performance. Our general impression during the test was that the 1 1/4 value ballast resistance combination was just OK under all conditions at normal voltages but might be expected to misfire occasionally at lower voltages i.e. 10 volts. As this condition is hardly ever experienced now owing to the more efficient dynamo-battery system we consider that the present Signed (contd) This Sheet must be filed on completion of the work. | ||