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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).
Specification for a non-temperature coefficient ballast resistance for two types of coils.

Identifier  ExFiles\Box 163\6\  img302
Date  5th February 1937 guessed
  
46016

SPECIFICATION OF NON-TEMPERATURE COEFFICIENT BALLAST RESISTANCE.

(1) For Std. Coil D.72503.

The wire to be 22.SWG. "Glowray"
39" long, which includes 1 1/2" each end
for connections. To be wound on the
present porcelain insulator.

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(2). Ph.III. Coil D.75260

Same as in (1)

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