Test report comparing spark plug voltage performance with and without a screen.
| Identifier | ExFiles\Box 162\4\ img016 | |
| Date | 22th June 1933 | |
| RR 238 (150 BKS.) (DB {Donald Bastow - Suspensions} 481-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To: WST Order No.: (Cont.) Customer's No.: Test No 3 Comparisons between plugs with screen on & off. Plug gaps were set at .025". The plugs then inserted in the compression chamber & put under a pressure of 40 lbs/sq". The voltage was measured on the two plugs with & without screens. TABLE DATA: CONDITION | PLUG 1 | | PLUG 2 | | KILO-VOLTS | DIFFERENCE | KILO-VOLTS | DIFFERENCE WITHOUT SCREEN | 6.25" | 0.3 KV OR 4.8% DROP | 5.65" | 0.4 KV OR 7.07% DROP WITH SCREEN | 5.95" | | 5.25" | Signed: G.H. Hurndell This Sheet must be filed on completion of the work. | ||
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).