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).
Test results for ignition wires for tank engines, comparing voltage performance with and without a screen.
| Identifier | ExFiles\Box 163\2\ img065 | |
| Date | 2nd August 1938 | |
| RR 239 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 44) MP 306975 x6008 (1 ROLLS-ROYCE LTD. INSTRUCTIONS. To: WST Date: 2/8/38 Order No. Customer's No. Ignition Wires for Tank Engines Two sets of ignition wires, Type L & Type SR, were tested under a constant pressure of 100 lbs/". the voltage measured both with & without the screens, resulted in the following. | TYPE | VOLTAGE WITH SCREEN | VOLTAGE WITHOUT SCREEN | % DIFFERENCE | |---|---|---|---| | L | 5900 | 5090 | 14 7/9 % INCREASE WITH SCREEN | | SR | 5500 | 4840 | 19.0 % INCREASE WITH SCREEN | Signed: A.W. Woodall This Sheet must be filed on completion of the work. | ||