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).
Translated letter from A. Tebaldi of Milan concerning thermodynamic tests on sparkling plugs and a vacuum pump coupling plan.
| Identifier | ExFiles\Box 58\2\ Scan127 | |
| Date | 14th June 1934 | |
| TRANSLATION. -------- Letter from A.{Mr Adams} Tebaldi, of Milan. June 14th. 1934. Dear Sir, I have had a report translated concerning the thermodynamic tests carried out on my sparkling plugs, with a view to enabling you to have an exact idea of the variation of the coefficient of heat transmission of the sparking plug, according to the working conditions. The numerous tests which have been carried out on the most varied types of engines, both air and water cooled, have proved of what great advantage this variation of coefficient is, not only because it enables the using of the same plug on engines of various types, but also - and this is perhaps the most important - because it works better at the various engine speeds. I trust that, after examination of the enclosed documents, you will be convinced of the advantages that can be obtained with this type of sparking plug. Messrs. Fimac are expecting to receive without delay your approval of the coupling plan, so that they can go on with the construction of the vacuum pump. Yours faithfully, | ||