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. to Rolls Royce providing an analysis of a soft black deposit sample.
| Identifier | ExFiles\Box 145\2\ scan0077 | |
| Date | 17th October 1935 | |
| Handwritten: Mrs Wilkinson Please acknowledge BY APPOINTMENT TO HIS MAJESTY THE KING MAKERS OF THE FAMOUS PATENT "CASTROL" MOTOR OILS. BY APPOINTMENT TO H.R.H. THE PRINCE OF WALES 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. PLEASE ADDRESS YOUR REPLY TO: RESEARCH DEPARTMENT, HAYES, Middlesex. Phone: HAYES 246/8 EAE/VS{J. Vickers} 17th October, 1935. Messrs. Rolls Royce Ltd., DERBY. For the attention of Mr. Rowbotham. Dear Sirs, We have examined the sample of soft black deposit which you showed me when I was at your Works recently. If you remember I expressed a desire to have it in spite of your assurance that it was of the usual type which you always found. Our analysis is as follows:- Free Oil 22.9% Oxidised oil soluble in benzene 1.1% Oxidised oil insoluble in benzene 16.7% Mineral matter 59.3% 100.0 Analysis of Mineral matter:- Silica 8.4% Lead oxide 31.2% Copper oxide 14.6% Tin oxide Trace Iron & aluminium oxides 39.6% Chromium oxide 1.0% Lime 2.8% | ||