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).
Specification for a non-temperature coefficient ballast resistance for use with D.75673 coils.

Identifier  ExFiles\Box 168a\5\  img079
Date  26th May 1937
  
Vio By/RD.
6145.
Rm{William Robotham - Chief Engineer}/Wst.1/JH.26.5.37.
Ballast Resistances for use with D.75673 coils.
On all our tests we are now obtaining better results using a non-temperature coefficient ballast resistance.
The specification of this ballast is as follows:-
39" long 32 S.W.G. "Glowray" wire. This length includes 1 1/2" each end for connections.
Will you please specify this ballast for use with the above coils.
Rm{William Robotham - Chief Engineer}/Wst.
See WCT/RC.{R. Childs}2/JH. 15.6.37
  
  


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