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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 British Filters Ltd providing an analysis of two oil samples.

Identifier  ExFiles\Box 136\3\  scan0141
Date  25th September 1941
  
[Handwritten top left]: Robotham Please return J.H.
noted [signature]

[Handwritten top right in red]: 1139

[Letterhead]
BRITISH FILTERS LTD
AIRCRAFT HOUSE
MARKET HARBOROUGH

T. C. Worth
R.{Sir Henry Royce} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} H.{Arthur M. Hanbury - Head Complaints} Taylor
W. S. Thompson

Market Harborough 2254-5

GENERAL FILTERS

TCW/MD.

25th September, 1941.

Rolls Royce Ltd.,
DERBY.

Dear Sirs,

For the attention of Mr. Robotham.

The following are properties of two samples of oil recently submitted by you in test tubes:

(a) Chassis 1. B.50.
Total oil mileage = 16,741.
1 Element only.

Insoluble in Pet. Ether 0.19%
ditto but Sol. in benzol 0.05%

Washing: Very small particles of metal visible but in small numbers.

(b) Chassis 12.B.V.
Total oil mileage = 25,795
5th Element now fitted

Insoluble in Pet. Ether 0.4%
ditto. but Sol. in benzol 0.03%

Washing: As sample (a) but with even fewer metallic particles.

Kindly note that for a full examination of the properties of used oil, a 1 pint sample is required.

Yours faithfully,

For & on behalf of BRITISH FILTERS LTD.
[Signature]
T C Worth
DIRECTOR.
  
  


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