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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).
Specifications for a transformer used for insulation testing to observe the breakdown voltage of samples.

Identifier  ExFiles\Box 24\2\  Scan062
Date  17th November 1920
  
X.1109

17.11.20.

X.1109 - TRANSFORMER FOR INSULATION TESTING. X.1581.

To be used for observing "Breakdown-voltage"
of samples.

Each test would last for a few minutes only.
The area of samples under test would be a
few square inches at most.

Damp samples allowing considerable leakage
current will be tested.

Note frequency now 50~~.

F.J.A.
  
  


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