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).
Graph plotting Reversibility % against Torque on Drop Arm for two different cam gear ratios.
| Identifier | ExFiles\Box 28\2\ Scan107 | |
| Date | 8th December 1932 | |
| 8/12/32-AC CAM GEARS LTD, LUTON REVERSIBILITY % 11 TO 1 RATIO 14 TO 1 RATIO TORQUE ON DROP ARM - INCH - LB. | ||