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 of Renault spark plugs compared to Pognon plugs.
| Identifier | ExFiles\Box 33\3\ Scan004 | |
| Date | 30th June 1909 | |
| R.R. 148. (20 H) (F.{Mr Friese} 23. 22.4.09) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6930. x926 June 30th.,1909 1600 Tests on Renault plugs, taken by Lowe 25/6/09. Tested on 3 Chassis on Dynamometer, running in all 80 miles on magneto. Power same as with Pognon plugs. Engine fired when switches off with .6 throat valve caps in as with Pognon plugs Plugs cleaned themselves and fired O.K. after being soaked in engine and gear oil as did Pognon plugs Plugs in this short test equal to Pognons. For full report see sheet on file "R" 30/6/09 | ||