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).
Drawing comparing old and new versions of a mechanical part with different views and cross-sections.
| Identifier | ExFiles\Box 152\2\ scan0013 | |
| Date | 6th July 1937 guessed | |
| A A .3437 .1875 NEW SECTION .125 OLD SECTION .3437 .1875 New Old .625 +.001 -.002 .500 ±.010 FIG VII | ||