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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 detailing the coefficient of friction and wear characteristics of an experimental brake lining.

Identifier  ExFiles\Box 26\4\  Scan299
Date  29th April 1926
  
[Handwritten at top: X719 43409]
FERODO LIMITED.
WIRES: "FRICTION, CHAPEL-EN-LE-FRITH".
TELEPHONES: 19, 20 & 21 CHAPEL-EN-LE-FRITH. (3 LINES)
Depots.
LONDON
222, TOTTENHAM COURT ROAD, W.1.
BIRMINGHAM
202, CORPORATION STREET.
MANCHESTER
32, CATHEDRAL STREET.
LIVERPOOL
1-3, BERRY STREET.
GLASGOW
65, BOTHWELL STREET.
BRISTOL
19, PARK STREET.
BELFAST
158, NORTH STREET.
LEEDS
25, HUNSLET ROAD.
BRIGHTON
84, QUEEN'S ROAD.
MESSRS T.S.ARMSTRONG & CO LTD,
NEWCASTLE ON TYNE
WORSWICK STREET, PILGRIM STREET.
MESSRS HASLAM & STRETTON LTD,
CARDIFF.
11, WINDSOR PLACE.
MR A.J.CRESWICK,
SHEFFIELD.
GATEFIELD.
MESSRS F.W.HARRIS & CO,
STOKE ON TRENT
MOORLAND ROAD, BURSLEM.
MR SIDNEY HILL,
COVENTRY.
1, QUEEN'S ROAD.
NORTHERN MILL & MINE FURNISHING CO,
CARLISLE
ANNETWELL STREET.
CODES:-
5TH EDITION A.B.C.
LIEBER'S.
MARCONI INTERNATIONAL.
WESTERN UNION FIVE LETTER EDS.
Regd Office & Works.
SOVEREIGN MILLS,
CHAPEL-EN-LE-FRITH.
VIA STOCKPORT.
All Communications to be addressed to the Company and not to Individuals
PLEASE ADDRESS YOUR REPLY.
DEPT. REF. FJF:AML
YOUR REF. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG
April 29th, 1926
Messrs Rolls-Royce Limited,
Experimental Department,
D E R B Y.
Dear Sirs:
In reply to your letter of the 27th instant, regarding coefficient of friction of the experimental brake lining containing lubricant. Ferobestos should furnish 0.25 ; Ferodo Bonded Asbestos 0.18 rising to 0.25 . The lower value will obtain until the lining is well worked in.
In regard to wear, we consider it will be rather less than with the standard material, notwithstanding the increased unit pressure. We are doing everything possible to get your clutch plate lined with the least possible delay, and will advise delivery date by a later post.
Yours faithfully,
F E R O D O L I M I T E D
F.{Mr Friese} J.{Mr Johnson W.M.} Field per
Chief Engineer.
OUR FOREIGN FACTORIES.
FRANCE: LA{L. A. Archer} SOCIÉTÉ ANONYME FRANÇAISE DU FERODO, 2 RUE DE CHATEAUDUN, PARIS.
U.S.A.: FERODO & ASBESTOS, INC., NEW BRUNSWICK, NEW JERSEY.
GERMANY: DIE DEUTSCHE FERODO GESELLSCHAFT, (TOPKEN & CO) GROSSBEEREN STRASSE, 126, BERLIN, MARIENDORF.
  
  


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