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).
Postscript discussing vehicle shackle noise and recommending specific English compound engine oils.
| Identifier | WestWitteringFiles\J\March1923\ Scan66 | |
| Date | 19th July 1917 | |
| R.R. 199 (250T) (SD676 19-7-17) MP180865 -2- P.S. On these roads the knocking of shackles seems universal. I believe the news that the 40/50 wears in a trip out here is hardly correct - either insufficiently closely fitted or alteration in the road surface make such knocks much more manifest. R.{Sir Henry Royce} I think French oil and Vacuum oil not wonderfully good - prefer English compound oils like Prices - Wakefields or the new compound oil of Shell (Ricardo) which should be available now I think good but needs proving. Bring as much as you can of what you think best for engine (car). R.{Sir Henry Royce} | ||