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).
Comparing the lubricating properties of Castrol 'XL', 'R', and Amber Gear oils for the steering nut and worm.
| Identifier | ExFiles\Box 67\4\ scan0389 | |
| Date | 8th September 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} OY. +h430 Hs{Lord Ernest Hives - Chair}/GWH{George W. Hancock - Head Chateauroux}1/LG8.9.27. RE. LUBRICATION OF STEERING NUT AND WORM. X524 We have tested Castrol 'XL' oil and find it to be equal for lubrication to Castrol 'R' and Amber Gear oil. We should [strikethrough] place the oils in the following order of merit :- Castrol 'R'. Castrol 'XL' Amber Gear oil'A'. Prices 'B'. Hl. has tested Amber Gear oil and reports that it is 99% mineral. Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||