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 plotting under-bonnet pressure in inches of water against vehicle speed in miles per hour.
| Identifier | ExFiles\Box 149a\2\ scan0274 | |
| Date | 20th August 1935 | |
| SHEET 7 UNDER BONNET PRESSURES - 3 - 6 - 1 PRESSURE TAKEN AT POINT CLOSE AGAINST DASH, ON CENTRE LINE OF ENGINE & BEHIND THE CARBURETTERS. O WITH FRONT LOUVRES TAKING IN AIR. X REJECTING AIR. TEMPERATURES AIR 25° 26° UNDER BONNET 50° 50° WATER 84° 82° Y-AXIS: INCHES OF WATER X-AXIS: MILES PER HOUR | ||