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).
Data table showing measurements for free length, compressed length, and return length of a component.
| Identifier | ExFiles\Box 151\2\ scan0243 | |
| Date | 29th May 1934 guessed | |
| -3- FREE LENGTH COMPRESSED LENGTH RETURNS TO .758 .640 .752 .752 .575 .748 .765 .575 .750 .780 .630 .772 .770 .600 .755 .775 .595 .770 .765 .590 .758 .750 .635 .740 .772 .575 .752 .762 .565 .742 .767 .550 .715 .770 .570 .750 .765 .580 .760 .575 .758 | ||