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 Sparking Plug Co. regarding the dispatch of sample Sinterkorund spark plugs for testing.
| Identifier | ExFiles\Box 163\5\ img021 | |
| Date | 9th May 1936 | |
| TELEGRAMS: SPHINX, DUNSTABLE TELEPHONE: DUNSTABLE 360 PRIVATE BRANCH EXCHANGE. 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. 9th 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, Sinterkorund Sparking Plug Samples. Further to our letter of the 29th ultimo and your reply thereto of the 30th April, we are now sending to you under separate cover today (per parcel post) further sample plugs with sinterkorund insulators, as follows: I. Two 14 mm. non-detachable type (one-piece) plugs marked X405 (heat characteristic Code No.4), II. Two 14 mm. non-detachable type (one-piece) plugs marked X406 (heat characteristic Code No.3). With regard to the gas tightness of this one-piece non-detachable design of plug, this must naturally to some extent depend on the operating temperature of the steel plug body, and we should naturally like this body to be maintained at as low a temperature as possible. The gas tightness will not be anything like so susceptible to the steel body temperature as in the case of the detachable plugs X404 and X403 which we sent to you some time ago, but this point is nevertheless still an important factor, and we should like you to appreciate it. I trust you will proceed fairly quickly to test these plugs on your single cylinder units, following which I shall be happy to come over to Derby to discuss the results with you. Yours faithfully, N.F. STOCKBRIDGE, Managing Director. MAKERS OF AC SPARKING PLUGS - AC AIR CLEANERS - AC PETROL PUMPS - AC PETROL GAUGES - AC OIL FILTERS - AC OIL GAUGES | ||