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).
Performance comparison of tyre pumps and slow speeds for various vehicles.
| Identifier | ExFiles\Box 126\2\ scan0014 | |
| Date | 17th March 1921 | |
| R.R. 235B (100 T) (S.H. 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2948 x.1525 Mr. Hives. 17.3.21. x 1692 Marmon tyre pump 500 r.p.m. pumps 60 lbs. in 10 mins. lowest slow speed 3.25 M.P.H. 40 M.P.H. speedometer 38.3 M.P.H. (time) x 4213 Dodge - slowest speed 6.3 M.P.H. 40 M.P.H. speedometer 40.9 M.P.H. (time) x 1525 Humber - slowest speed 4.5 40 M.P.H. speedometer 38.3 M.P.H. time. x 3923 E.EX slowest speed 3.75 M.P.H. 40 M.P.H. speedometer 38.3 M.P.H. time. | ||