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).
Letter discussing the working length of blocks and the choice between three types of material mixes.
| Identifier | ExFiles\Box 45\2\ Scan218 | |
| Date | 8th February 1930 guessed | |
| -2- The set up working length of all these blocks will be 1.00" and we should like to know, when you have decided what mixes you are going to use, which of the three types will be least likely to take a set when permanently compressed to 1.00". Yours faithfully, For Rolls-Royce Ltd. | ||