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 effect of cyanide treatment on the decarburised surface of American Silico-Manganese road spring plates.
| Identifier | ExFiles\Box 154a\4\ scan0061 | |
| Date | 7th December 1937 guessed | |
| LABORATORY. EFFECT OF CYANIDE TREATMENT ON DECARBURISED SURFACE OF AMERICAN SILICO - MANGANESE ROAD SPRING PLATE. TESTS WITH 30 KG LOAD / 1 MM. BALL. BRINELL HARDNESS OF OUTER LAYER DEPTH BELOW SURFACE IN 1/1000" (481) 60 MINS. IN CYANIDE BATH O.Q. & T. (483) 30 MINS. IN CYANIDE BATH AIR COOLED & REHEATED O.Q & T. (480) 15 MINS IN CYANIDE BATH. O.Q & T. (473) 15 MINS IN CYANIDE BATH. AIR-COOLED & RE-HEATED O.Q & T. (465) 30 MINS IN CYANIDE BATH O.Q. & T. (466) 5 MINS IN CYANIDE BATH O.Q & T. M 1486 | ||