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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).
Fuse wire specifications and recommending cartridge fuses over open-type fuses for certain circuits.

Identifier  ExFiles\Box 166\7\  img107
Date  23th June 1939
  
6071

To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/RC.{R. Childs}
c. By/RD.

RE FUSES.

With reference to memo By/RD.5/B.16.5.39, we have ascertained that No.37 SWG tinned copper wire will fuse at 10 amps, when used in the standard R.R. open type fuse-holder.

We cannot recommend the use of an open type fuse holder for a 3 amp fuse. If copper were used the wire would only be about .003" thick; even if lead were used the wire would only be .010 inch and very easily damaged. We feel that a cartridge type fuse should be used here.

We have verified that the fusing currents of 10 and 3 amperes given by the coachbuilders are correct for the respective circuits.

Rm{William Robotham - Chief Engineer}/RC.{R. Childs}
  
  


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