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 an Acme thread test for B50 rear axle oil seals, measuring leakage variation with pressure and shaft speed.
| Identifier | ExFiles\Box 111\4\ scan0112 | |
| Date | 2nd May 1939 | |
| ACME THREAD TEST (B50 REAR AXLE OIL SEALS) VARIATION OF LEAKAGE WITH PRESSURE AND SPEED OF SHAFT TEMPERATURE 50°C DETAILS SCHEME GCD 1340. HOUSING BL 1029 BUSH BL 980 OIL CASTROL XL 30 LEAKAGE (PTS. PER HR.) PRESSURE (LBS/sq") SPEED OF SHAFT 500 R.P.M. 1000 R.P.M. 1500 R.P.M. 2000 R.P.M. SHAFT NOT REVOLVING BL 2336 SHEET I 2.5.39 | ||