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 detailing modifications to a vacuum pump cylinder for an S.S. Engine.
| Identifier | ExFiles\Box 64\1\ scan0041 | |
| Date | 27th February 1922 guessed | |
| V640. SIZE & POSITION OF EXHAUST PORT IS UNALTERED. .031 RAD. SCALE 1/1. FOR ALL OTHER DIMENSIONS SEE E78794. MODIFICATION TO VACUUM PUMP CYL. (S.S. ENGINE) 1.875 CTR. ±2 1.044 CTR. ±2 .0625 +5 .125 +5 .400 ±10 | ||