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).
Testing K.L.G. screened ignition plugs for tank engines, with results tabulated for performance under different pressures.
| Identifier | ExFiles\Box 162\4\ img014 | |
| Date | 22th June 1933 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 44) MP 306975 < 1918. B (1) ROLLS-ROYCE LTD. INSTRUCTIONS. To: WST Order No. Customer's No. Date: 22/6/33 Reference: 19 Report on K.L.G. sparking plugs. Type K1W. Screened ignition plugs for Tank engine Tests No 1. Test if plug screen fails with water dripping on cables & plug screens generally. Plugs were fitted on compression chamber at approximately the same angle, as when fitted to the engine. The cable & screens were fitted together as per K.L.G. instructions, two plugs tested at the same time. | Pressure lbs/sq in | Plugs with screens off | Plugs with screens on but without water | | --- | --- | --- | | 160 | | | | 140 | No Spark | No Spark | | 120 | Sparking | " | | 100 | " | " | | 80 | Sparking lightly, weaker | Sparking but misfiring | | 60 | Sparking weak | Sparking | | 40 | " | Sparking weaker | | 20 | very weak | " | Signed This Sheet must be filed on completion of the work. (Cont.) | ||