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).
Data sheet comparing underbody measurements for Spectre, Cadillac, and Phantom models.
| Identifier | ExFiles\Box 4\1\ 01-page149 | |
| Date | 7th November 1934 | |
| - sheet 2 - E/JNR.{Charles L. Jenner}4/HP.7.11.34. SpectreCodename for Phantom III Cadillac. Phantom. bump No.2. Under rear silencer, front point. 9.25" 10.15" 7.8" 4.4 Under front silencer. 8.4" - 8.2" 6.1 Under rear crossmember prop. shaft. 9.4" - 7.25" .2.800 E/JNR.{Charles L. Jenner} C/f | ||