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 of lubricants for different worm gear applications, ranked by preference.
| Identifier | ExFiles\Box 67\4\ scan0377 | |
| Date | 3rd October 1927 guessed | |
| ORDER OF PREFERENCE. A) FOR PARKING. (LOWEST µ). B) FOR JOGGLES. (HIGHEST µ). Column 1: '720 WORM. Motoline B. .0925 Landoil. .0990 Castor. .1020 Amber A.{Mr Adams} .1081 Motoline C. .1081 Iso-Vis. .1180 Sperm. .1266 P.A. .1287 Mobile E.{Mr Elliott - Chief Engineer} .1977 (over 100% worse than Motoline B) Column 2: '940 worm. Motoline C. .1123 P.A. .1128 Castor. .1183 Iso-Vis. .1269 Column 3: '720 worm. Sperm. .0913 Iso-Vis. .0890 Amber A.{Mr Adams} .0431 Land } .0358 Mobil E} Motoline C. .0313 Castor .0256 Motoline B. .0178 P.A. .0137 Motoline B .01 [struck through] Column 4: '940 worm. Iso-Vis. .0688 Motoline C. .0551 Castor .0528 P4 .0492 | ||