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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).
Comparing the bore and crank pin diameter of Pierce Arrow parts to the company's 20 HP model.

Identifier  ExFiles\Box 23\4\  Scan019
Date  31th March 1928
  
X4588

To Na.{Mr Nadin} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
c. to BJ.

Hs{Lord Ernest Hives - Chair}/Rn{Mr Robinson}/LG31.3.28.

X4588
X5010

We thank you for your note of the 17th. inst.
with reference to the Pierce Arrow parts. These will be
of considerable interest in spite of the fact that the bore
is 3¾", because we think they are remarkably light considering
that the crank pin dia. of the Pierce Arrow is no less than
2¼" against the 1.5" of our 20 HP.

Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}
  
  


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