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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 pressure test failure of a Spectre Oil Cooler.

Identifier  ExFiles\Box 131\1\  scan0141
Date  2nd November 1935
  
FILE. X/114 2.11.35.

SPECTRECodename for Phantom III OIL COOLER.

LeC.4386. Pressure Test.

The cooler submitted (off No.5 test bed) was subjected to a gradually increasing pressure up to a maximum of 200 lbs/sq.".

There was a very slight sweat at the matrix to casing joint (opposite to the unions) at 180 lbs/sq.in.

The pressure was increased to 200 lbs/sq.in., and at first the leak was not increased, but after maintaining this pressure for 30 mins., the joint opened out for practically its whole length.

Hs{Lord Ernest Hives - Chair}/W.Bell.
  
  


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