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).
Suggested method for torsionally testing a 40/50 front axle.
| Identifier | Morton\M1.A\ img019 | |
| Date | 29th October 1921 | |
| N SCH 979 40/50 FRONT AXLE WEIGHT CARRYING TRAYS ROLLS-ROYCE, LIMITED PRINT ROOM -1 NOV. 1921 DERBY SUGGESTED METHOD OF TESTING FRONT AXLE TORSIONALLY OA 29.10.21 N SCH 979 | ||