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).
Blueprint and data table showing wear measured during endurance tests on a 'Wraith' Bakelite oil pump cover.
| Identifier | ExFiles\Box 149\2\ scan0204 | |
| Date | 12th April 1939 guessed | |
| COVER - 'WRAITH' BAKELITE OIL PUMP. WEAR MEASURED DURING ENDURANCE TESTS. [DIAGRAM OF PUMP COVER WITH TWO CIRCULAR RECESSES LABELLED A, B AND C, D] TABLE: | TOTAL TIME RUN - HOURS | DRIVING GEAR BUSH. | DRIVEN GEAR BUSH. | |------------------------|----------|----------|----------|----------| | | AA{D. Abbot-Anderson} | BB | CC | DD | | 0 | 0 | 0 | 0 | 0 | | 2 | -.0003" | 0 | -.0001" | +.0004" | | 52 | 0 | +.0007" | +.0002" | +.0001 | | 162 | +.0002" | +.0020" | +.0003" | +.0002 | | 652 | +.0002" | +.0030" | +.0004" | +.0002 | FIG III A.{Mr Adams} | ||