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).
Wire confirmation detailing modifications to a vacuum pump piston and cylinder for retesting.
| Identifier | ExFiles\Box 64\1\ scan0010 | |
| Date | 5th September 1928 | |
| CONFIRMATION OF WIRE. X7510 WW. 5. 9. 28. HIVES. ROYCAR. DERBY. SS.{S. Smith} VACUUM PUMP ADD PIECE POINT TWO THICK TO PISTON TOP RECUT SUCTION PORT ON EXISTING CYLINDER POINT TWO LOWER RETEST. ELLIOTT. | ||