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).
Extract regarding testing and performance of a speedometer instrument (B.563) for a 40/50 model.
| Identifier | ExFiles\Box 50\4\ Scan241 | |
| Date | 18th June 1928 | |
| X43058B Extract from GOB/W, 18.6.28. (A.T. Speedometer Co.Ltd) We trust that when you go to carry out similar tests on the small instrument (B.563) which we have made up for your 40/50 same will also show the good results, and we would ask you to bear in mind that this would similarly be advanced one mile at 60 m.p.h. and would in our opinion, never indicate on the slow side unless the temperature of the car exceeded 30° centigrade, that is to say of course, with this advancement. | ||