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).
Blueprint comparing the cylinder block lengths of the Wraith, TSN's, and a Sleeve Valve engine.
| Identifier | ExFiles\Box 133\2\ scan0160 | |
| Date | 20th June 1935 guessed | |
| WRAITH 34.0 TSN'S ENGINE 28.5 SLEEVE VALVE 33.0 FIG. 3 8 CYL 3.125 BORE S/V.{VIENNA} ENGINE COMPARED WITH WRAITH & TSN'S ENGINE. | ||