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 showing the mechanical efficiency of a La Salle steering system against load.
| Identifier | ExFiles\Box 28\3\ Scan060 | |
| Date | 16th November 1934 guessed | |
| MECHANICAL EFFICIENCY OF LA{L. A. Archer} SALLE STEERING. BOX RATIO 20 : 1. HELIX ANGLE 7 : 4° REVERSE FORWARD STATIC EFFICIENCY IN MID POSITION. 80 70 60 50 40 30 0 100 200 300 400 LOAD AT PENDULUM LEVER - LBS. | ||