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).
Photographic example of extreme wear on a Hypoid, Rear-Axle Pinion due to lubricant type.
| Identifier | ExFiles\Box 114\1\ scan0075 | |
| Date | 11th January 1937 guessed | |
| Operated for approximately 5,000 miles, without wear, on a powerful lead-soap active-sulfur extreme-pressure lubricant. Wear shown in photograph (approximately one-third of original tooth thickness) occurred in less than 300 miles of operation, on a mild sulfur-saponifiable lubricant. Hypoid, Rear-Axle Pinion. Fig. 22 | ||