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).
Graph comparing petrol delivery for Autovac and Grav-Vac fuel systems against induction pipe depression on a 40/50 engine.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan054 | |
| Date | 22th June 1927 | |
| Y-AXIS: PETROL DELIVERY (PTS/HR) X-AXIS: INDUCTION PIPE DEPRESSION (INS. MERCURY) TITLE BOX: PETROL DELIVERY AT 1000RPM. AUTOVAC AND GRAV-VAC. PETROL RAISED 32". THROTTLING CURVE ON 40/50 ENGINE (R=4.25:1) LEGEND: AUTOVAC : --- GRAV-VAC : --- REFERENCE/DATE: J326/2Y 22.6.27 | ||