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).
Chart of Brinell hardness tests on a component section using a Rockwell Hardness Tester.
| Identifier | ExFiles\Box 48\4\ Scan140 | |
| Date | 12th August 1924 guessed | |
| Chart of Brinell tests made on the Rockwell Hardness Tester with 1/16" steel ball and a load of 150 Kg. 286 286 244 256 286 231 193 214 202 207 207 A B Key to position of section - shaded part distorted. | ||