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).
Summary of tests on the lubrication of worm and nut steering using different oils, with efficiency ratings.
| Identifier | ExFiles\Box 67\4\ scan0385 | |
| Date | 1st August 1927 guessed | |
| contd : -2- it is not the only factor to be considered. Thus Iso-Vis is thicker than Amber gear oil but less efficient, Mobile 'E' thicker than lard or sperm, but has a considerably greater tendency to promote sticking than either. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} SUMMARY OF TESTS ON THE LUBRICATION OF WORM AND NUT OF STEERING USING DIFFERENT OILS. The temperature in each case was approx. 59°C. Taking the efficiency of the steering with Prices amber gear oil as 100% for purposes of comparison. Amber gear oil .................... 100% Prices B. ......................... 98% Castor ............................ 96% Prices C. ......................... 96% Iso-Vis ........................... 90% Sperm ............................. 75% Lard .............................. 50% Mobile E.{Mr Elliott - Chief Engineer} ......................... 25% Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} | ||