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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).
Drawings for an air pump for four-wheel brakes, noting a required modification to springs.

Identifier  ExFiles\Box 183\M22\  img224
Date  19th October 1922
  
ORIGINAL
E1/M19.10.22.

RECEIVED 18 OCT 1922
TO C.C.
FROM H.S.
c. to H.S.

"HERON" - AIR PUMP FOR FOUR WHEEL BRAKES.
X3150
X4550

We send you herewith drawings Nos. Lec^t 1641 & 1643 shewing respectively air pump and control valve springs, and air pump cam. The springs given on Lec 1641 differ slightly from those drawn on Lec 1626 & 1639, as the final calculations shewed that some modification was necessary.

Would you kindly issue the necessary instructions?

E.{Mr Elliott - Chief Engineer}
  
  


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