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 on the torsional deflection of front road springs.
| Identifier | WestWitteringFiles\L\July1924-September1924\ Scan76 | |
| Date | 20th March 1924 guessed | |
| -2- TORSIONAL DEFLECTION OF FRONT ROAD SPRINGS! SPRINGS USED FOR THESE TESTS :- No. of spring. Std: 40/50. No. 3 No. 4 Piece No. F.4634 F.71244 F.71568 Type. 1150 1150 1150 Length. 42" 43¼" 43½" Period with 104 oscl:min. 120 oscl: 107 oscl:min. load of 1150 lbs. min. contd :- | ||