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 thrust tests on Hoffmann ball race bearings.
| Identifier | ExFiles\Box 8\11\ 11-page169 | |
| Date | 19th May 1939 | |
| BALL RACE THRUST TESTS HOFFMANN BALL RACE Nº 325 000 WITH " " " Nº R325 000 AS SECONDARY BEARING. THRUST APPLIED AND READINGS TAKEN HORIZONTALLY. STATIC LOAD NIL. THRUST - INS - THRUST LOAD - LBS - OIL +.004, +.003, +.002, +.001 -.001, -.002, -.003, -.004 500, 400, 300, 200, 100 | ||