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).
Comparison of weights between the present and old type cylinders.
| Identifier | ExFiles\Box 3\3\ 03-page008 | |
| Date | 26th February 1910 | |
| R.R. 129 100 13/11/08 200 W.&S. Ld 5280 Enquiries x200 3700 CYLINDER WEIGHTS Present type 1200 9 cylinder stripped (except Valves and springs) - 103 lbs Willans & Robinson casting Old type 60583 - no plug in top of cylinder - Royce casting, 93 lbs - i.e. 10% lighter (? heavier) Recorded 26-2-10 | ||