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).
Table of Single Cylinder Army Octane Numbers for blends of Isopropyl Ether and Technical Iso-octane in Knock Reference Fuel C-9.
| Identifier | ExFiles\Box 150\1\ scan0218 | |
| Date | 30th January 1936 guessed | |
| Table V Single Cylinder Army Octane Numbers of Blends of Isopropyl Ether and Technical Iso-octane in Knock Reference Fuel C-9. Blends of Reference Fuel C-9 Volume % of Isopropyl Ether Volume % of Crude Iso-octane Octane Numbers by Army Method Clear With 3 cc Tetra-ethyl lead/gallon Clear Blending Value of Blending Agent 0, 0, 74.8, 93.0, - 10, 0, 79.0, 94.0, 117 20, 0, 82.7, 96.6, 114 30, 0, 85.7, 98.4, 111 40, 0, 88.3, Equals Iso-Octane + 0.18 cc Lead, 109 50, 0, 90.6, Ditto + 0.44 cc lead, 106 60, 0, 93.5, " + 0.82 " ", 106 5, 5, 77.8, 93.6, 105 10, 10, 81.5, 96.0, 108 15, 15, 84.1, 97.6, 106 20, 20, 86.7, 99.2, 105 25, 25, 88.8, Equals Iso-Octane + 0.08 cc lead, 103 30, 30, 91.0, Ditto + 0.22 cc lead, 102 0, 30, 82.0, 97.0, 99 0, 40, 84.4, 98.7, 99 0, 50, 86.5, Equals Iso-Octane + 0.05 cc lead, 98 (Data obtained through the courtesy of Major S. D. {John DeLooze - Company Secretary} Heron, Ethyl Gasoline Corporation). | ||