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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 experiments on self-servo action and spring interleaving.

Identifier  ExFiles\Box 154a\2\  scan0087
Date  22th April 1939
  
1305
All Communications to be addressed to the Company.
FERODO LIMITED
TELEPHONE: 250 CHAPEL-EN-LE-FRITH
TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH.
FERODO
BRAKE & CLUTCH LININGS
REGD. TRADE MARK
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.
CHAPEL-EN-LE-FRITH,
STOCKPORT, ENGLAND.
Depots-
LONDON
222, TOTTENHAM COURT RD
W. 1.
ABERDEEN
26, GUILD STREET.
BELFAST
8, 10 & 12, MONTGOMERY ST
BIRMINGHAM
198, CORPORATION ST
BRISTOL
118, VICTORIA STREET.
CARDIFF
60, CHARLES ST
DUBLIN
120, UPPER ABBEY ST
GLASGOW
70, WATERLOO ST
LEEDS
25, HUNSLET RD
LIVERPOOL
BERRY STREET.
MANCHESTER
16, JACKSON'S ROW,
DEANSGATE.
NEWCASTLE-ON-TYNE
21, ELDON PLACE,
BARRAS BRIDGE.
22nd April, 1939
YOUR REF.
OUR REF. WES/PW.
Messrs. Rolls-Royce Ltd.,
Derby.
For the attention of Mr. Dixon.
Dear Sirs,
Referring again to your letter of the 29th March, we have tried several expedients in an attempt to eliminate the assumed self-servoing action but so far with little success.
We are now trying the rig with a ball bearing between the spindle and armature shaft but cannot yet say if this will effect any improvement.
We would also refer to the experiments which you are carrying out with respect to spring interleaving, and we wonder if you have any road test reports available on the behaviour of the interleaving and the springs to which it is fitted. The position with regard to this item and its further development in other directions by Mr. Woodhead depends to some extent on your experiences with this material, and if a report from you is possible at this stage we might again raise the subject with Mr. Woodhead.
Yours faithfully,
FERODO LIMITED.
W.E. Shilton
Manager,
Technical Department.
  
  


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