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 Vacuum Oil Company regarding test reports on two samples of Extreme Pressure Oil.
| Identifier | ExFiles\Box 145\1\ scan0228 | |
| Date | 10th September 1937 | |
| 1229 BY APPOINTMENT VACUUM OIL COMPANY LIMITED GARGOYLE REGD TRADE MARK TELEPHONE WHITEHALL 1010 (14 LINES) VACUUM INTERNATIONAL MOTOR EXHIBITION CARS & BOATS OCT 14-23 EARLS COURT OUR STAND No. 228 FIRST FLOOR CAXTON HOUSE . WESTMINSTER LONDON . S.W.1 REFERENCE OTJ. 10th September 1937 S. H.{Arthur M. Hanbury - Head Complaints} Grylls Esq., Messrs Rolls Royce Ltd., DERBY. Dear Mr. Grylls, We attach hereto Test Reports on the two samples of Extreme Pressure Oil which you forwarded in connection with your letter of the 12th August, marked Sample "A" and Sample "B". You will see from the two analyses that there is very little difference in the two samples. I attach two further sheets marked No.1 and No.2., which give the tests by means of the Cornell Machine. As you know the temperature continuously rises during such tests and it is impossible to hold it at any specific figure. These tests appear to be in every way satisfactory, and are difficult to compare with a test on GARGOYLE HYPOID GEAR LUBRICANT because Lead Soap Lubricants do not function satisfactorily in the Cornell Testing Machine, nor for that matter in any other type of Extreme Pressure Testing Machine. The samples "A" and "B" which you forwarded are evidently Extreme Pressure Lubricants not specially intended as Hypoid Gear Oils, as is shown by the Laboratory Report where there is a Sulphur Content of 0.44% but no Lead Soap. Hypoid Gear Lubricants usually show very rapid wear on the specimen in the usual type of Extreme Pressure Testing Machines as compared with E.P. Gear Oils, although as you know often the Hypoid type of oil does a better job than the E.P. type oil in actual service. This seems to be one of the problems that the S. A.{Mr Adams} E.{Mr Elliott - Chief Engineer} are trying to solve in getting a universally-acceptable Testing Machine. UNLESS STATED OTHERWISE ALL OILS ARE QUOTED AND INVOICED PER UNIT GALLON OF 9 LBS. AND ALL QUOTATIONS ARE WITHOUT ENGAGEMENT. | ||