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).
The principles of water cooling under pressure, including a graph showing boiling point versus gauge pressure for a Silver Ghost radiator.
| Identifier | ExFiles\Box 178\1\ img037 | |
| Date | 15th February 1926 guessed | |
| - 21 - (5) WATER COOLING UNDER PRESSURE. (i) Principles. Under normal atmospheric pressure of 14.7 lbs/sq.in. water boils at 100°C. If this pressure is reduced by creating a partial vacuum, the water boils at a temperature below 100°C. If, on the other hand, the pressure in the vessel containing the water is increased by a pump or other means, the temperature at which the water boils is increased above 100°C. Graph VIII shews the manner in which the boiling point rises with increasing pressure (test results - Silver Ghost radiator). [Graph showing a linear relationship between Boiling Point in degrees Celsius and Gauge Pressure in LBS/sq". The x-axis (Boiling Point C°) ranges from 100° to 110°. The y-axis (Gauge Press. Above Ats. Lbs/sq") ranges from 0 to 6.] If the temperature at which the water boils is raised, the critical temperature or atmospheric temperature at which the car will boil is also raised. That is, if a car would normally be made to boil if driven on full throttle indefinitely when the contd. | ||