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).
Results of a De Dion oil test, its composition, and comparison with other oils.
| Identifier | ExFiles\Box 32\4\ Scan070 | |
| Date | 24th September 1910 | |
| R.H. 835a (100H) (P 355. 18.8.10) E.P. 785a. 24th Sept. 1910. Re De Dion Oil Test. C.J. and Mr. Barrington. 24/9/10 x 1099 RG{Mr Rowledge}/D24910 With reference to Mr. Barrington's report of the 19th. inst. (attached), I believe the De Dion oil to be a good hydro carbon oil of mineral origin only; that is, it contains no animal or vegetable fats. I think some animal or fatty matter is needed. (I believe the British Government specify 6% for internal combustion engines on submarines). Reducing the wear to a minimum and leaving the engine smooth to turn after a long, hard pull is a good sign, but we have not yet found anything better than Prices B for summer use and C for winter use. Is Mr. Barrington sure that we have had long enough to tell if the carbon deposit is the same? Prices should be informed that the test we require should be for the carbon deposit left in the cylinders, rather than | ||