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).
Schematic diagram showing the operation of an S.S. Vacuum Pump.
| Identifier | ExFiles\Box 64\1\ scan0008 | |
| Date | 4th September 1928 | |
| S.S. VACUUM PUMP. PISTON AT BOTTOM OF STROKE AIR ENTERING OUTLET PORT INTO CYL DUE TO PRESSURE DROP DURING LATTER .200 PISTON TRAVEL SUCTION PORT AT BOTTOM OF STROKE PISTON UNCOVERS TOP PORT - PISTON PORT IS THEN .200 BELOW BOTTOM PORT CENTRE. .800 STROKE .600 .200 PISTON TRAVEL .200 OF ITS UPWARD STROKE AFTER .200 UPWARD TRAVEL OF PISTON AIR IS EXPELLED FROM CYLINDER THROUGH SUCTION PORT. FOR PUMP SCHEME SEE L.C.'S 2470-2478. STAMP: ROLLS-ROYCE, LIMITED PRINT ROOM, 4 SEP 1928 DERBY. INITIALS: aeb | ||