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).
Vacuum systems for moisture removal and appropriate temperature indicators.
| Identifier | ExFiles\Box 24\2\ Scan296 | |
| Date | 7th April 1928 | |
| -9- Contd. should not be of such a nature as to require expulsion. As regards the vacuum, a figure of 30 in. has been mentioned as desirable; there appears to be no reason for this other than to impress one with the importance of the plant. The function of the vacuum is merely to assist the removal of moisture by evaporation at a lower temperature than the boiling point of water at atmospheric pressure, 100 deg. C., which is too near the temperature at which cotton and silk are damaged. Therefore a good commercial vacuum is all that is necessary in order that the temperature of evaporation may be sufficiently far removed from the point where damage might result. The temperature indicator should be of the thermo-couple or pyrometric type. In conclusion, it may be questioned whether the term "combined vacuum-pressure system" is a happy choice." Sgd. C.W. Crosbie. Northampton, April, 7th 1928. | ||