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 the Experimental Department detailing the octane numbers of two fuel samples.
| Identifier | ExFiles\Box 89\1\ scan0172 | |
| Date | 28th November 1935 | |
| XN61 a Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}8/KW. 28th November, 1935. R.{Sir Henry Royce} Summers, Esq., Denna Hall, Burton Point, Chester. Dear Dick, I have now got the value of the two samples of fuel which you gave me. The octane numbers are as follows - Fuel No. 1 70.5 Octane Fuel No. 2 70.0 Octane From the blue print that I sent you, you will observe that this is about the figure given by the Ethyl Export Corporation for No. 1 petrols. Yours sincerely, | ||