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).
Table of combinations for inner and outer springs for the Spectre independent front wheel suspension, arranged by loads and rates.
| Identifier | ExFiles\Box 154\1\ scan0176 | |
| Date | 13th September 1934 guessed | |
| SHEET (5) TABLE III. COMBINATIONS OF INNER AND OUTER SPRINGS. SPECTRECodename for Phantom III INDEPENDENT FRONT WHEEL SUSPENSION. (1) ARRANGED IN ORDER OF LOADS. Normal Load lbs. | Rate lbs/in. | No. of Combination. 1000 | 101.8 | 1 1008 | 100.8 | 2 1078 | 110.9 | 3 1092 | 111.2 | 5 1100 | 110.2 | 6 1108 | 114.6 | 4 1120 | 111.2 | 9 1128 | 110.2 | 10 1141 | 111.2 | 13 1149 | 110.2 | 14 1171 | 120.3 | 7 1200 | 120.3 | 11 1203 | 124.0 | 8 1220 | 120.3 | 15 1228 | 124.0 | 12 1250 | 124.0 | 16 (2) ARRANGED IN ORDER OF RATES. Rate lbs/in. | Normal Load lbs. | No. of Combination. 100.8 | 1008 | 2 101.8 | 1000 | 1 110.2 | 1100 | 6 110.2 | 1128 | 10 110.2 | 1149 | 14 110.9 | 1078 | 3 111.2 | 1092 | 5 111.2 | 1120 | 9 111.2 | 1141 | 13 114.6 | 1108 | 4 120.3 | 1171 | 7 120.3 | 1200 | 11 120.3 | 1220 | 15 124.0 | 1203 | 8 124.0 | 1228 | 12 124.0 | 1250 | 16 | ||