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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).
Required specifications for fuse wires for the chassis switchbox and junction box.

Identifier  ExFiles\Box 61\2\  scan0408
Date  8th October 1920
  
Ms. from By.{R.W. Bailey - Chief Engineer}
CEFC.

X.2515.
X.3749.
X.3564.

X2515

By4/P8.10.20.

CHASSIS - SWITCHBOX AND JUNCTION BOX.

Referring to EFC's memo on the above subject, what we actually require for the fuse wires on the above appears to be as follows:-

(1) Fuse wire for Switchbox.

The second sample received under cover of the London Electric Company's letter of the 28th September, and which is 30 SWG, is the correct material and gauge for the switchbox, as this fuses with 5.3 amperes of current and therefore falls within our limits quoted, namely, 4.5 amperes minimum to 5.5 amperes maximum.

(2) Fuse wire for Junction box.

None of the samples supplied meet our requirements but it appears pretty certain that a wire made from the same material as that supplied in the 17, 18 and 30 SWG, with their letter of Sept. 28th. made up in 19 SWG, would meet our requirements.

We have analyzed this material and so far as we can see it appears to be 96.5 pure tin with slight quantities of lead and cadmium etc. to make up the 100%

Of course we feel sure that the London Electric Wire Company will have a record of the alloy in question.

Would you kindly write to them giving them the above information and obtaining a further sample of the approved material made up to 19 SWG.

By.{R.W. Bailey - Chief Engineer}
  
  


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