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).
Drawing of a 'Hispano' front shoe with dimensions and a cross-section view.
| Identifier | ExFiles\Box 73\2\ scan0244 | |
| Date | 9th February 1924 guessed | |
| HISPANO FRONT SHOE. 12.2" SECTN. A.A. 2.5 .7 .3 .30 .25 2.4 | ||