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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 from C.C. Wakefield & Co. regarding the film rupture strength of lubricants.

Identifier  ExFiles\Box 145\2\  scan0149
Date  4th June 1937
  
BY APPOINTMENT
Makers of the Famous “PATENT CASTROL” Motor Oils.
1231
C. C. Wakefield & Co., Limited.
MANUFACTURERS OF HIGH CLASS LUBRICANTS.

GOVERNING DIRECTOR,
VISCOUNT WAKEFIELD OF HYTHE.

MANAGING DIRECTOR,
W.R.GRAHAM.

DIRECTOR & SECRETARY,
J.{Mr Johnson W.M.} BROWNE.

TELEPHONES: CITY 4411 (10 LINES).

RESEARCH DEPARTMENT.

Wakefield House,
Cheapside,
London, E.C.2.

EAE/AF
4th June, 1937.

Messrs. Rolls-Royce Limited,
DERBY.

For the attention of Mr. Grylls.

Dear Sirs,

We thank you for your letter of the 31st ultimo, Ref. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}7/AP.

It has been customary for us to determine the film rupture strength of E.P. lubricants on the Almen testing machine. Castrol Hi-Press has always been made to withstand a minimum of 15,000 lbs. per square inch when tested on this machine. We cannot tell you what is the maximum film rupture strength of Castrol Hi-Press, because we do not make a habit of continuing the loading until a breakdown is observed because of the risk of damaging the Almen machine.

Hypoy is designed to carry a very much higher loading. Obviously, the film rupture strength is well without the reach of the Almen machine. You are no doubt
  
  


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