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).
Future use of metric dimensions over English standard inch dimensions in design.
| Identifier | ExFiles\Box 20\7\ Scan112 | |
| Date | 23th November 1921 | |
| contd:- -2- R8/G23.11.21. ------------ shall in future only use those of metric dimensions, but considering our English standard list includes those of inch dimensions, it may be difficult to avoid these occasionally being included in a design. R.{Sir Henry Royce} | ||