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 for a Wraith Bakelite oil pump's driving and driven gears during endurance tests.
| Identifier | ExFiles\Box 149\2\ scan0205 | |
| Date | 12th April 1939 guessed | |
| WRAITH BAKELITE OIL PUMP WEAR MEASURED DURING ENDURANCE TESTS. DRIVING GEAR DRIVEN GEAR FIG III B. DRIVING GEAR TOTAL TIME RUN - HOURS | UU | VV | WW | XX | YY | ZZ 0 | 0 | 0 | 0 | 0 | 0 | 0 2 | -.0002 | -.0002 | -.0003 | -.0002 | -.0003 | -.0002 52 | -.0003 | -.0002 | 0 | -.0002 | -.0004 | +.0002 152 | -.0004 | -.0003 | 0 | -.0002 | -.0005 | +.0002 652 | -.0006 | -.0006 | 0 | -.0004 | -.0005 | 0 DRIVEN GEAR TOTAL TIME RUN - HOURS | JJ | KK | LL | MM | NN 0 | 0 | 0 | 0 | 0 | 0 2 | -.0003 | -.0003 | 0 | 0 | +.0003 52 | 0 | 0 | +.0003 | +.0003 | +.0001 152 | -.0001 | 0 | +.0004 | +.0003 | -.0001 652 | -.0003 | 0 | +.0007 | +.0006 | -.0006 Diagram Labels: Driving Gear: U, V, W, X, Y, Z Driven Gear: J, K, L, M, N | ||