Rolls-Royce Archives
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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).
Test report and specifications for an automatic switch on chassis 15-EX.

Identifier  ExFiles\Box 59\1\  Scan246
Date  2nd February 1928
  
EFC.
AC.100
X4008
2.2.28.
AUTO SWITCH F ON 15-EX. X.4008
This switch is made up in accordance with our latest particulars. The resistance winding is of 22.6 ohms in 40 odd turns.
After heating on 17.0 volts, the points open at 17.0 volts and close at 12.3 volts with dynamo standing down to 11.8 volts with dynamo running at 2500 r.p.m. The dynamo was a Phantom machine K set to standard output.
The switch is now on 15-EX doing a 10000mile test in France.
EFC/F.J.Allen.
  
  


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