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).
Comparative Brinell and V.P.N. hardness test results for A.C.7. Bearing Alloy.
| Identifier | ExFiles\Box 115\3\ scan0147 | |
| Date | 16th November 1937 | |
| COMPARATIVE BRINELL AND V.P.N. HARDNESS FIGURES OBTAINED ON AC.7. BEARING ALLOY POT Nº1 BATCH Nº 1. 16.11.37 SEE REPORT M1/2/RS.{Sir Henry Royce's Secretary} 9.12.37 AND PHOTOGRAPH Nº M.{Mr Moon / Mr Moore} 1500/1. TESTS MADE ON TRANSVERSE SECTION CUT FROM WALL OF POT HALF WAY BETWEEN TOP AND BOTTOM AS SHOWN IN SMALL SKETCH. Diagram Labels: V.P.N.10Kg. VICKERS 1MM/10KG. ROCKWELL .125/100.8 Kg. Diagram Data Points: Top row: 46.3, 46.6, 46, 46.2 Second row: 46.1, 45.6, 44, 46.9 Third row: 45.1, 48.1, 47, 47.8 Bottom row: 38.7, 48, 44, 49 NOTE CONSISTENT RESULTS ONLY OBTAINED IN OUTER LAYERS WHICH ARE MACHINED AWAY. LABORATORY M.{Mr Moon / Mr Moore} 1482 | ||