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 and data table comparing the steering movement ratio for the New Phantom (.720 Worm Lead) and Marles steering systems.
| Identifier | ExFiles\Box 67\4\ scan0013 | |
| Date | 8th February 1926 guessed | |
| NEW PHANTOMCodename for PHANTOM I (.720 WORM LEAD) AND MARLES STEERING THE RATIO OF MOVEMENT OF STEERING WHEEL TO PENDULUM LEVER AXIS LABELS: Y-Axis: ANGLE OF STEERING WHEEL X-Axis: ANGLE OF PENDULUM LEVER GRAPH ANNOTATIONS: LEFT HAND LOCK RIGHT HAND LOCK MARLES STEERING NEW PHANTOMCodename for PHANTOM I STEERING (.720 LEAD) DATA TABLE: Headers: ANGLE OF PEND LEVER | MARLES STEERING R.H. LOCK | MARLES STEERING L.H. LOCK | NEW PHANTOMCodename for PHANTOM I STEERING (.720 Lead) R.H. LOCK | NEW PHANTOMCodename for PHANTOM I STEERING (.720 Lead) L.H. LOCK 1° | 19° | 18° | 18° | 17° 2° | 36° | 35° | 33° | 33° 3° | 53° | 52° | 48° | 48° 4° | 68° | 67° | 64° | 64° 5° | 83° | 82° | 78° | 76° 6° | 98° | 100° | 94° | 91° 7° | 114° | 116° | 110° | 106° 8° | 128° | 133° | 127° | 121° 9° | 148° | 150° | 141° | 137° 10° | 164° | 165° | 154° | 153° 11° | 182° | 182° | 171° | 168° 12° | 197° | 200° | 187° | 182° 13° | 215° | 215° | 203° | 200° 14° | 234° | 232° | 216° | 215° 15° | 248° | 246° | 228° | 227° 16° | 264° | 262° | 245° | 242° 17° | 281° | 277° | 261° | 255° 18° | 295° | 294° | 275° | 271° 19° | 314° | 310° | 290° | 285° 20° | 328° | 325° | 303° | 297° 21° | 345° | 343° | 317° | 312° 22° | 361° | 358° | 332° | 326° 23° | 376° | 375° | 347° | 338° 24° | 394° | 392° | 363° | 353° 25° | 408° | 408° | 377° | 366° 26° | 429° | 427° | 391° | 381° 27° | 446° | 444° | 406° | 395° 27°15' | | | 408° | END OF TRAVEL 28° | 464° | 458° | 420° | 29° | 480° | 475° | 434° | 30° | 497° | 496° | 447° | 31° | 513° | 508° | 461° | 31°15' | 518° | | | 32° | END OF TRAVEL | 525° | 474° | 33° | | 542° | 489° | 34° | | 557° | 500° | 34°15' | | | 502° | END OF TRAVEL | | 562° END OF TRAVEL | END OF TRAVEL | | ||