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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 an instrument company regarding modifications to a sample transmitting radiator thermometer.

Identifier  ExFiles\Box 175\4\  img010
Date  2nd September 1922
  
TELEGRAMS: INSTRUMENT, CAMBRIDGE.
CODES: A.B.C. (5TH AND 6TH EDITIONS); WESTERN UNION; BENTLEY'S.
TELEPHONE: CAMBRIDGE No. 615.

V3897? [handwritten]

THE CAMBRIDGE AND PAUL INSTRUMENT COMPANY, LIMITED,

INCORPORATING
THE CAMBRIDGE SCIENTIFIC
INSTRUMENT CO., LTD., CAMBRIDGE,
AND
ROBT. W. PAUL, LONDON.

REGD. TRADE MARK.

HEAD OFFICE AND SHOWROOMS:
45, GROSVENOR PLACE, LONDON. S.W.1.
WORKS:
LONDON AND CAMBRIDGE.

YOUR REF.....................
CAMBRIDGE, ENGLAND.
IN-REPLY PLEASE QUOTE....... WGC/MFR

September 2nd, 1922.

Messrs. Rolls-Royce, Ltd.,
Nightingale Road,
Derby.

Fault [handwritten] By [handwritten]

Dear Sirs,

We have pleasure in sending under separate cover to-day the sample transmitting radiator thermometer. You will notice that we have not adopted your suggestion of employing flexible metallic tubing for the support of the capillary tubing, but have used internally curved sleeves. We have tried out both methods and find that with the necessarily small diameter flexible metallic tubing, very little support is given to the tubing. With the present arrangement we find that the risk of breakage is decreased to about 1/10th of that of the original construction. You will notice also that we have made a modified form of clamp, having a much larger bearing surface, and trust you will deem this satisfactory.

On the sample instrument we have used the normal dial, but we enclose two (somewhat defective dials) showing other styles of figuring. The writer has used the plainer of
  
  


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