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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 Vacuum Oil Company Limited reporting on Mobiloil 'EP' test results.

Identifier  ExFiles\Box 145\1\  scan0215
Date  5th July 1937
  
BY APPOINTMENT
1229
VACUUM OIL COMPANY LIMITED
TELEPHONE WHITEHALL 1010 (14 LINES)
GARGOYLE
REG. TRADE MARK
TELEGRAMS VACUUM . PHONE . LONDON
CAXTON HOUSE . WESTMINSTER . LONDON . S.W.1
REFERENCE OTJ
5th July 1937
Messrs. Rolls-Royce Limited,
DERBY
For the attention of Mr. S.H. Grylls
Dear Sirs,
We thank you for the courtesy extended to the Writer on the 30th June, and wish to confirm that the test on the Mobiloil "EP{G. Eric Platford - Chief Quality Engineer}" sample taken from the gearbox after 16 hours' running at 120°C showed the lubricant to be in satisfactory condition, so far as the ordinary analysis could indicate.
Samples of the same oil were put in the Cornell testing machine, and a load of 1,500 lbs was carried for a full period of one hour without excessive rise in torque, and without signs of breakdown, either on the pin or the Vee blocks, which were in both cases showing signs of even wear. The rate of wear with the used oil was slightly higher than in the case of the unused, but was still well within the acceptable limits.
There was sufficient oil left to carry out two Cornell tests, both of which proved entirely satisfactory, although it is usual to take an average of four such tests before coming to definite conclusions, owing to the difficulty of getting uniform results out of any of the existing EP{G. Eric Platford - Chief Quality Engineer} testing machines on the market.
At the same time, samples of aluminium alloy, steel and phospher-bronze were placed in a beaker with Mobiloil "EP{G. Eric Platford - Chief Quality Engineer}" and maintained at a temperature of 125°C for 5 days. Air was blown through the oil intermittently, but no signs of corrosion were observed on the steel or aluminium alloy; on the phospher-bronze there was only a slight darkening where the bronze was in contact with the oil and air. This result is regarded as very favourable.
UNLESS STATED OTHERWISE ALL OILS ARE QUOTED AND INVOICED PER UNIT GALLON OF 9 LBS. AND ALL QUOTATIONS ARE WITHOUT ENGAGEMENT
  
  


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