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).
Laboratory report comparing the percentage distillate of two different petrol spirits at various temperatures.
| Identifier | ExFiles\Box 50\3\ Scan162 | |
| Date | 11th August 1921 | |
| COPY. Hs.{Lord Ernest Hives - Chair} H12/EB11.8.21.Laboratory. Re 2 Petrols submitted today. Tank. Bottles. Lighter spirit Heavy spirit (round bottle) (medicine bottle) Temperature. Percentage distilate. 100 C 6.8 - 110 14.0 - 120 21.8 - 130 36.2 - 140 46.4 - 150 60.2 - 160 73.2 18.4 170 82.8 37.6 175 86.6 180 - 54.2 190 - 69.2 200 - 77.2 205 - 83.4 These are heavy spirits. H1 | ||