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 between the Waltham and Elliott speedometers, recommending the substitution of the latter.
| Identifier | ExFiles\Box 36\1\ scan 080 | |
| Date | 18th July 1921 guessed | |
| - 2 - The Waltham speedometer is actually cheaper than the Elliott, and it appears to us that if it is a better instrument we should lose no time in substituting it. C/Bs.{A J. Barnes - Assistant Manager} | ||