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. Ltd. detailing the results of testing four used Castrolite oil samples.
| Identifier | ExFiles\Box 145\2\ scan0196 | |
| Date | 12th December 1938 | |
| BY APPOINTMENT Makers of the Famous "PATENT CASTROL" Motor Oils. 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 (11 LINES) RESEARCH DEPARTMENT. PLEASE ADDRESS YOUR REPLY TO: RESEARCH DEPARTMENT, HAYES, Middlesex. Phone: HAYES 246/8 EAE/AF 12th December, 1938. G.A. Grylls, Esq., Messrs. Rolls-Royce, Ltd., DERBY. Dear Mr. Grylls, I have pleasure in referring to your letter of the 26th November, Ref. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}5/MH{M. Huckerby}, for which I thank you. We have tested the four samples of used Castrolite with petroleum ether, b.p. under 40°F, and find that the weights of precipitate formed are as follows:- A - 7,036 0.04% B - 12,383 0.02% C - 1,023 Trace D - 4,868 0.1% new centrifuge films The amounts are so small that it is hardly worth making any comment upon them. For your visual inspection, however, I am sending to you the actual filter papers. I think you will agree that it would be almost impossible to do anything more with them. Yours sincerely, E.{Mr Elliott - Chief Engineer} A.{Mr Adams} Evans. | ||