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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).
Assessment of Marelli magnetos, noting their robust construction, unique contact breaker, and use in other vehicles.

Identifier  ExFiles\Box 4\5\  05-page333
Date  28th April 1925
  
no one can see these Sheets except those you choose
X.430.
ROLLS-ROYCE LTD.
INSTRUCTIONS.
To: E.{Mr Elliott - Chief Engineer} &. C.
Date: 28 - 4 - 1925
Order No.: W B 10
Supplier's No.: X430

Marelli Magnetos.
These appear to be well made magnetos embodying well designed features, the contact breaker especially being of unique construction.
The component parts appear robust and the principle of casting everything monoblock is sound.
No information is given as to the electrical performance, which we assume is good judging by the number of Continental Automobile manufacturers who fit this magneto as standard. The special racing [strikethrough]Duesenberg[/strikethrough] car for the Indianapolis race USA is fitted with Marelli magnetos.

Signed: H.E.W.
This Sheet must be filed on completion of the work.
  
  


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