Rolls-Royce Archives
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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).
Test procedure involving Sodium Chloride and a discussion on water hardness treatment.

Identifier  ExFiles\Box 149a\3\  scan0029
Date  24th August 1920
  
R.H. mssm 50 T) (S.G. 755, 24-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2650

H11/EB29720. Contd.

-2-

Sodium Chloride maintaining the solutions and tubes at about 90° C for eight hours, cooling during sixteen hours, then another eight hours at 90° C and so on. We will report the action after two or three days but will keep the tests on for a considerable time.

Free carbon dioxide (or carbonic acid) is always present in "temporary" hard water; it is removed by the addition of Lime (an alkaline substance) & "permanent" due of chlorides & sulphate of lime & magnesia are also eliminated by an alkaline substance i.e. Sodium carbonate so that - it is difficult to consider it alkaline before treatment.

HCHb
  
  


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