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 the relationship between boiling point in degrees Celsius and pressure depression in inches of mercury (Ins Hg).
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan031 | |
| Date | 14th January 1930 guessed | |
| BOILING POINT °C 100 95 90 85 80 DEPRESSION Ins Hg 2 4 6 8 10 12 ① | ||