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 showing the percentage of American production of 8-cylinder, 12-cylinder, and 16-cylinder cars from 1926 to 1939.
| Identifier | ExFiles\Box 144\4\ scan0052 | |
| Date | 27th March 1940 | |
| Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} Rm.{William Robotham - Chief Engineer}19/ML.27.3.40. 1104 It is interesting to note from the American side, their records of the 1939 production, and that 8-cylinder cars are still gaining in popularity. YEAR. PER CENT EIGHTS. PER CENT TWELVES AND SIXTEENS. TOTAL 1926. 2.0. *** 100.0 1927. 3.2. *** 100.0 1928. 4.3. *** 100.0 1929. 5.0. *** 100.0 1930. 11.8. 0.1 100.0 1931. 14.5. 0.2 100.0 1932. 31.1. 0.6 100.0 1933. 34.7. 0.3 100.0 1934. 38.8. 0.2 100.0 1935. 39.4. 0.2 100.0 1936. 32.4. 0.6 100.0 1937. 33.7. 0.8 100.0 1938. 35.4. 1.0 100.0 1939. 36.7. 0.8 100.0 Rm.{William Robotham - Chief Engineer} | ||