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).
Wear measurements recorded during endurance tests for a Wraith Bakelite oil pump cover.
| Identifier | ExFiles\Box 149\2\ scan0189 | |
| Date | 24th March 1939 | |
| 24-3-39 WRAITH BAKELITE OIL PUMP WEAR MEASURED DURING ENDURANCE TESTS COVER [Drawing of a cover with two circular bushes, labelled A, B on the left and C, D on the right] | TOTAL TIME RUN IN HOURS | DRIVING GEAR BUSH | DRIVEN GEAR BUSH | |---|---|---| | | AA{D. Abbot-Anderson} | BB | CC | DD | | 2 | -.0003 | 0 | -.0001 | +.0004 | | 52 | 0 | +.0007 | +.0002 | +.0001 | | 152 | +.0002 | +.0020 | +.0003 | +.0002 | | 652 | +.0002 | +.0030 | +.0004 | +.0002 | WL BL 2317/A | ||