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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 Borg & Beck Company Ltd. concerning clutch plate deflection graphs for the Phantom III.

Identifier  ExFiles\Box 129\1\  scan0212
Date  1st July 1937
  
Telegrams
BORGANBECK,
LEAMINGTON SPA.

Telephone
LEAMINGTON SPA 1550-1.

BORG & BECK COMPANY LTD.
MANUFACTURERS OF CLUTCHES.

Registered Office
BROCK HOUSE,
LANGHAM STREET,
LONDON, W. I.

WORKS:
Tachbrook Road.
LEAMINGTON SPA.
Warwickshire.

Directors
E.{Mr Elliott - Chief Engineer} B. BOUGHTON.
W. EMMOTT.
D.{John DeLooze - Company Secretary} T. BROCK.

Your Ref...................

Our Ref HA/WM

1st July, 1937

W.A. Robotham Esq.,
Messrs. Rolls-Royce Ltd.,
D E R B Y.

Dear Mr. Robotham,

I am enclosing herewith Deflection Graphs which we have made of the Long type Phantom III Plate and one similar of the 100 which we are about to build for you, using the Cushion Plates of .031" thick material.

From these, you will see that the rate of deflection is considerably higher on the English made plate than on the Long.

I should discount overall thicknesses, as we had to use a pair of Facings which we had available of the old 'Hyco' type.

I am arranging personally to have the Long type plate returned to you to-night, and I hope that same will arrive safely at your place tomorrow.

SUMMARY OF CURVES
CLAMPING PRESS. LBS. | DEFLECTION
LONG | EX27309
500 | .018 | .026
1000 | .024 | .041
1500 | .026 | .047
1900 | .0264 | .0505
2000 | .0265 | .051
2500 | .027 | .053

Yours sincerely,
BORG & BECK COMPANY LTD.

H.{Arthur M. Hanbury - Head Complaints} Armitage
Manager

(Handwritten Notes)
Top Center: 1.10
Bottom: See Curve Rm{William Robotham - Chief Engineer} 407 (in file 312)

(Stamp)
Left side, red circle: Enclosure
  
  


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