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 to AC-Sphinx Sparking Plugs Ltd. regarding a design conflict with a hexagon dimension.
| Identifier | ExFiles\Box 163\5\ img033 | |
| Date | 6th June 1936 | |
| r6011. HS{Lord Ernest Hives - Chair}/Wst.18/JH. 6th June, 1936. Messrs. AC-Sphinx Sparking Plugs Ltd., Dunstable, Bedfordshire. For the attention of Mr. N.F. Stockbridge. Dear Sirs, In reply to your letter of the 5th inst. we regret that this size of hexagon shewn on your drawing is out of the question as there is no clearance for the spanner in the tube on the inlet side. The hexagon flat dimension must not exceed .820" and the only way out of the difficulty would appear to be a reduction in the dia. of the insulator unless you arranged to weld the screen extension to the plug body instead of screwing it. We now await your further comments. Yours faithfully, FOR ROLLS ROYCE LTD. | ||