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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).
The decision to not recommend the use of sodium phosphate due to a tendency to cause priming.

Identifier  ExFiles\Box 27a\3\  Scan093
Date  3rd December 1929
  
HS{Lord Ernest Hives - Chair}
[STAMP: RECEIVED 1929]
HH.
c. Hs.{Lord Ernest Hives - Chair}
c. BL.
c. HP.
X4516
BY23/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3.12.29.
USE OF SODIUM PHOSPHATE Na{Mr Nadin}₂H P O₄.
---------------------
Please note that it has been decided that in view
of the tendency to prime which occurs when the sodium phosphate is
added to the water, it has been decided for the present that we
are not to recommend the use of this to customers.
In the case of Mr. Short's car, priming occurred,
and although a double quantity of sodium phosphate had been added
it shows that we are too near the margin of safety in regard to
losing water, to permit us to go ahead with this scheme.
BY.{R.W. Bailey - Chief Engineer} By
  
  


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