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).
Diagram illustrating the geometry and deflection of a torque arm, lower lever, and yoke assembly.
| Identifier | ExFiles\Box 127\1\ scan0360 | |
| Date | 9th May 1938 guessed | |
| Normal position (67½°) giving .117" deflection. Frame ℄ Position giving no deflection L = 112°. A A₁ Torque arm. Lower lever. Yoke. Fig. II. NB. The position of the Arm. A on the Packard for no sideways movement makes an angle of approximately 103° with the frame ℄ | ||