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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 on coil failure in bakelite cases and the solution using a stabalite case for the Goshawk coil.

Identifier  ExFiles\Box 172\2\  img002
Date  10th November 1922
  
Expt. Test Report.

EFC1/T10.11.22.

It has been amply proved by numerous tests that whereas coil failure can almost invariably be produced on the coil in bakelite case by extreme conditions, the phenomenon does not take place under any condition of road usage when using a 40/50 coil in its own standard stabilite case.

It has also been demonstrated that the substitution of a stabalite case for the bakelite case for the Goshawk coil eliminates the phenomenon.

EFC.
  
  


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