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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 discussing the suitability of by-pass versus centrifugal filters and requesting drawings for design DES.220.

Identifier  ExFiles\Box 136\3\  scan0112
Date  17th December 1940
  
Handwritten top: Ask Hunt to let me have a set of detail drawings of Des 220. Jm{Mr Morley}

BRITISH FILTERS LTD
AIRCRAFT HOUSE
MARKET HARBOROUGH

T.C.Worth
R.G.H.Taylor
W.S.Thompson

Market Harborough 2254-5

GENERAL FILTERS

TCW/MD.

17th December, 1940.

W.A. Robotham, Esq.,
Park Leys,
Duffield,
Derby.

Handwritten middle: oil filters 1139

Dear Roy{Sir Henry Royce},

In reply to your letter of the 25th November and referring to our recent discussion, I am convinced that the by-pass filter would be more suitable than the centrifugal filter for the engine which you had in view quite apart from the difficulties of manufacture.

I would however, be very glad if you would send me detailed drawings apertaining to your drawing DES.220 in order that we may go into the matter for future consideration.

The criticism that I would make off hand is that the bowl is not large enough for continuous running.

Yours sincerely,

[Signature]

P.S. I've sent your letter to the Autocar.
  
  


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