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).
And testing different anti-freeze solutions such as salt, soda, and methylated spirits for radiators.
| Identifier | ExFiles\Box 151\3\ scan0009 | |
| Date | 16th November 1914 | |
| Wor {Arthur Wormald - General Works Manager} /EH12/L161114 . Sheet. 2 the engine raced it will immediately drop. If the car is left standing running light the temperature is hotter than if it is running at 50 m.p.h., it is solely due to the pump not circulating the oil at low engine speeds. Another point against the oil is that in time it will destroy the rubber hose connections. Salt solution. I have tested several different strength solutions, a 10% (by weight) solution becomes "mushy", that is, not frozen hard but like melted snow at 5º below zero; a 20% solution is quite all right at 8º below zero. This is a very cheap and handy method but we want to make very certain that the salt water will not set up any chemical action in the radiator. We know the boat engines use sea water successfully but at Cowes I heard that they have had trouble with engines that have copper or brass water jackets, due to the action of the salt water. Soda solution. This was not a success. Methylated spirit. Mr Hallam informed us that the Army Service Corps recommend this to be put in radiators. I find a 10% solution will not freeze at 9º C. below zero, this is when the solution is first made, after it has been boiled well it will freeze | ||