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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).
Instruction for measuring the maximum voltage of a coil secondary using a sphere gap voltmeter.

Identifier  ExFiles\Box 69\1\  scan0281
Date  8th January 1930
  
X8710.

-3a-

To be inserted after (7)

The maximum voltage put up by the coil secondary at the end of this period, i.e. with no flashing over the ends, shall be ascertained by means of sphere gap voltmeter.

8.1.30.
  
  


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