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).
Letter from AC-Sphinx regarding the supply and testing of various types of sinterkorund and K9 spark plugs.
| Identifier | ExFiles\Box 163\5\ img028 | |
| Date | 29th May 1936 | |
| TELEGRAMS: SPHINX, DUNSTABLE TELEPHONE: DUNSTABLE 360 PRIVATE BRANCH EXCHANGE. 86011 THE AC-SPHINX SPARKING PLUG Co. LTD. DIRECTORS: N. F.{Mr Friese} STOCKBRIDGE, W. O.{Mr Oldham} KENNINGTON, C. J.{Mr Johnson W.M.} BARTLETT. DUNSTABLE BEDFORDSHIRE OUR REF. NFS/GEB. YOUR REF. 29th May, 1936. Messrs. Rolls-Royce Limited, Derby. For the Attention of Mr. H.{Arthur M. Hanbury - Head Complaints} E.{Mr Elliott - Chief Engineer} West. Dear Mr. West, I take this opportunity of thanking you for our reception yesterday. When it is considered that the first sample sinterkorund plugs which we have furnished to you have been truly "a shot in the dark", I think we can regard your report on their performance as most encouraging. I deal with the various points which we have covered with you as follows: (1) We will proceed as soon as possible with a set (twentyfour) of these 14 mm. sinterkorund plugs to enable you to run a complete engine test. These plugs are to be 14 mm. thread, 14 mm. reach; they will be non-detachable and will be provided with mica-lined shielding, and they will be furnished with a tungsten central electrode with two side electrodes. Before we complete these plugs we shall experiment with the chromium-plating of the bottom insulator seating gasket. If any fundamental point arises in the design of these plugs we will communicate with you before proceeding. (2) I am sending to you under separate cover today six type K9 plugs with end gapping, with the gaps set at .055". I shall be interested to see your report on the running of these plugs. (3) I am also sending you under separate cover today four 10 mm. sinterkorund plugs (heat characteristic 8). These plugs will demonstrate to you the soundness of the insulation, and will undoubtedly constitute a development in the sparking plug field that has many attractive possibilities. If you can find time to do so, I should welcome your testing these plugs on one of your high duty single cylinder test units, and in that case I should be interested to have your report as soon as possible. MAKERS of AC SPARKING PLUGS - AC AIR CLEANERS - AC PETROL PUMPS - AC PETROL GAUGES - AC OIL FILTERS - AC OIL GAUGES | ||