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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).
Letter to Commander Robertson regarding the weight of raw materials for a gun and an agreed material substitution.

Identifier  ExFiles\Box 176\3\  img125
Date  22th August 1940
  
C O P Y.

Rm.{William Robotham - Chief Engineer}2/ML.

9a
for reply
See Cdr.{W. J. Chandler - Chief Clerk} Willis
22.8.40.

Commander Robertson, R.N.
Empire Hotel,
B A T H.{Arthur M. Hanbury - Head Complaints}

Dear Commander Robertson,

I am not quite clear whether you wanted the weight of the raw materials or the weight of the actual finished part, with regard to the gun.

I send you herewith, however, a list of the raw material required to produce one of the guns, less the mounting.

It has been agreed that Vibrac may be replaced by Admiralty steel, specification S.38, heat-treated to give a minimum of 50 tons per square inch yield (OO).

Yours sincerely,
  
  


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