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).
Graph showing the results of lever tests, plotting torque against the angle of twist for different fit types.
| Identifier | ExFiles\Box 6\6\ 06-page154 | |
| Date | 26th April 1937 | |
| WRAITH II SERRATED / PRESSED FIT LEVER TESTS L.G. 5375 26-4-37 EX 25164 SHAFT EX 25165 LEVER BOLTED TO BED TORQUE APPLIED AT END OF LEVER ANGLE OF TWIST - DEGREES TORQUE LB-FT TEST No 1 .005" CLEARANCE ON SERRATIONS. TEST No 2 .002" INTERFERENCE ON SERRATIONS. A, B, A1, B1, A2, B2 PROPOSED STIFFNESS FOR N.S.P. | ||