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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 Ferodo Limited discussing photomicrographs, disc slotting, and Servo Disc friction characteristics.

Identifier  ExFiles\Box 141\3\  scan0330
Date  15th November 1934
  
All Communications to be addressed to the Company.

FERODO LIMITED

TELEPHONE: 19 CHAPEL-EN-LE-FRITH (4 Lines)
TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH.

FERODO
REGD. TRADE MARK
BRAKE & CLUTCH LININGS

CHAPEL-EN-LE-FRITH,
VIA STOCKPORT, ENGLAND.

CODES: WESTERN UNION FIVE LETTER EDITION, BENTLEYS COMPLETE & 2ND PHRASE, MARCONI INTERNATIONAL, LIEBER'S CODE, LIEBER'S LATEST CODE, A.B.C. 5TH & 6TH EDITIONS.

Depots:-
LONDON
222, TOTTENHAM COURT RD
W. 1.
ABERDEEN
26, GUILD STREET.
BELFAST
8, 10 & 12, MONTGOMERY ST
BIRMINGHAM
19B, CORPORATION ST
BRIGHTON
84, QUEEN'S ROAD.
BRISTOL
19, PARK STREET.
CARDIFF
39, CHARLES ST
DUBLIN
120, UPPER ABBEY ST
GLASGOW
70, WATERLOO ST
LEEDS
25, HUNSLET RD
LIVERPOOL
1 - 3, BERRY STREET.
MANCHESTER
32, CATHEDRAL ST
NEWCASTLE-ON-TYNE
WORSWICK CHAMBERS.
10, WORSWICK ST
OFF PILGRIM ST

S. W. Grylls Esq.,
Messrs Rolls Royce,
Derby.

15th November 1934.

YOUR REF. Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}17/KW.
OUR REF. JNL/IS.

Dear Mr Grylls,

I thank you for your letter of November 12th, and I am doing all I can to obtain photomicrographs of the structure recommended. We have made this recommendation to so many people and have sent them sections of photomicrographs so that now no more of the photographs exist. I am trying to get the negatives from the University of Sheffield, and expect to be able to comply with your request within the next two or three days.

With regard to the VM.30 discs, I much regret that I overlooked the matter of slotting these, but the major problem was that of bedding in, and I was so relieved at being able to do this on a production scale if necessary, that I quite forgot the slotting.

While on the subject of the Servo Disc, I have been thinking along these lines as follows:

Our normal friction characteristic, as shown by our type of test, is, with most things, .38, rising a little with temperature to .42. This on your type of test shows very marked "fade". Accordingly, if we can produce a material which on our test machine rises appreciably, say, from .38 to .53, then logically your test machine should convert this type of curve to very nearly a horizontal line. We have made material with this characteristic in brake lining form this last week, and I am now putting in hand some of your Servo Discs. These will be sent to you in the near future, probably tomorrow.

Yours very truly,

J Morley

Chief Chemist,
FERODO LIMITED.
  
  


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