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).
Performance graph comparing two configurations of an expanding choke carburettor based on RPM.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan100 | |
| Date | 21th October 1929 guessed | |
| EXPANDING CHOKE CARB. EXPTS. SOLID LINE: EXPANDING CARB WITH RESTRICTOR REMOVED AND CENTRAL JET PUT IN ITS PLACE GIVING FREE CHOKE AREA OF 1.400 □" DASHED LINE: EXPANDING CARB WITH RESTRICTOR GIVING A MAX FREE CHOKE AREA OF 1.35 □" X-AXIS (R.P.M.): 750, 1000, 1250, 1500, 1750, 2000, 2250, 2500 Y-AXIS: 40, 50, 60, 70, 80, 90, 100, 110 | ||