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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 American Bosch Magneto Corporation detailing the resistance of TC-30 and TC-31 ignition coils.

Identifier  ExFiles\Box 61b\4\  scan0106
Date  2nd December 1928
  
AMERICAN BOSCH MAGNETO CORPORATION
Springfield, Massachusetts

December 2, 1928.

Rolls-Royce of America, Inc.,
Springfield, Mass.

Att: A.{Mr Adams} C. Ross, Pur. Agt.

Gentlemen:

Answering your letter of November 29th, we are glad to advise you that the resistances in ohms of the primary and secondary windings of our TC-30 and TC-31 ignition coils are approximately as follows:

Primary Secondary
6 Volt - TC-30 1.25 4700
12 Volt - TC-31 4.2 7000

We allow a tolerance of ±0.1 ohms on the primary and ±1000 ohms on the secondary.

Yours very truly,

AMERICAN BOSCH MAGNETO CORPORATION

F.{Mr Friese} N. Perry.
  
  


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