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 detailing a modification to a vacuum pump cylinder for an S.S. engine.
| Identifier | ExFiles\Box 64\1\ scan0043 | |
| Date | 28th June 1938 guessed | |
| V640. 1.875 CTR. ±2 1.044 CTR. ±2 .0625 ±5 SIZE & POSITION OF EXHAUST PORT IS UNALTERED. .031 RAD. .125 ±5 .400 ±10 SCALE 1/1. FOR ALL OTHER DIMENSIONS SEE E78794. MODIFICATION TO VACUUM PUMP CYL. (S.S. ENGINE). | ||