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 diagram showing a cutaway view of a Grav-Vac Fuel Tank with labelled components.
| Identifier | ExFiles\Box 40\3\ Scan084 | |
| Date | 9th November 1920 | |
| GRAV-VAC FUEL TANK SUCTION PETROL INLET FILTER AIR RELEASE VALVE SUCTION VALVE (Shown Open) BELL CYLINDER MAXm PETROL HEIGHT IN BELL CYLINDER INNER VACUUM CHAMBER MECHANISM CONTROLLING RISE AND FALL OF BELL CYLINDER. MAXm PETROL LEVEL IN OUTER TANK AND INNER VACUUM CHAMBER | ||