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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).
Extract from a memo discussing a proposed electrical alteration for the cigar lighter to prevent it from blowing a fuse.

Identifier  ExFiles\Box 65\2\  scan0245
Date  26th June 1930
  
X7741a

Extract from memo in X.7770 ref. Da{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}1/M26.6.30.

(7) The cigar lighter is connected to the junction box on the back of the dash. This junction box is fed from No.6 fuse in the main junction box. On No.6 fuse also are the instrument board lights and the warning light. Since the cigar lighter takes 15 amps. No.6 fuse is often blown. If it were made sufficiently large to stand the cigar lighter plus all the other instruments on it, it would be no safeguard against the warning lamp or instrument lights. E.{Mr Elliott - Chief Engineer} agrees that this body light distribution box on the back of the dash might be fed from before No.6 fuse instead of after it. We would be glad if Derby would set this small alteration out.
  
  


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