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).
Instructions on neutralizing acidic solutions and a table of calcium chloride concentrations for anti-freeze.
| Identifier | ExFiles\Box 151\3\ scan0018 | |
| Date | 15th September 1914 | |
| (W.W. 754. 15-9-14) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 6768. -3- If it is impossible to obtain the former, the latter may be made fit for use by neutralizing the acid. To do this, add ammonia or soda ash gradually to the calcium chloride solution until blue litmus paper no longer turns pink when moistened with the solution. The amount of calcium chloride to use may be found from the curve, Fig. 3, or from the table: Pounds of Calcium Chloride per Gallon. Freezing Point. Degrees Fahrenheit. 2........................... 18.0 above zero. 3........................... 1.5 above zero. 4........................... 17.0 below zero. 5........................... 39.0 below zero. Many other anit-freezing liquids have been experimented with but have been found to be inferior to those described. Various oils, including lubricating oil and kerosene, have been tried but these cause decay of the rubber hose connections, lack sufficient heat capacity and in many cases evaporate too rapidly. There are any number of salts besides calcium chloride that will give a low enough freezing point but are not suited for use because of their high cost or action on the metallic parts of the cooling system. It is for the latter reason that common table salt and sal-ammoniac are not employed. 1804. MADE AT CROXLEY | ||