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 the Champion Sparking Plug Co. Ltd. regarding the unsuitability of their NA.10 plugs due to a high heat factor and a request for a batch designed to run hotter.
| Identifier | ExFiles\Box 162\3\ img013 | |
| Date | 18th August 1936 | |
| r6000. H s/Wst.11/MA. 18th August, 1936. The Champion Sparking Plug, Co.Ltd., 83, Pall Mall, London, S.W.1. Dear Sir, We have tested the 24 NA.{Mr Nadin}10 plugs which you have submitted for test and regret that these are not suitable due to their heat factor being too high, i.e. they oil up very easily. Could you send us a further batch of plugs which are designed to run hotter? Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||