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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).
Query regarding the current draw and fusing safety of adding multiple auxiliary electrical fittings to a single circuit.

Identifier  ExFiles\Box 61\2\  scan0484
Date  1st March 1927
  
1 Copy to Mr. B.K. VID
3 Copies S/W Hs.{Lord Ernest Hives - Chair} B K T19
1 Copy to Mr E.C.B
Copy to EP.{G. Eric Platford - Chief Quality Engineer} EY.

X2515

(Mirrored stamp text)
WORKSGERBERTS MILL THE CRECY.
OF ... PLACE TTD BY
CWB8/GM2.3.27. ON BEHALF
OF TECHNICAL INSPECTION DEPT
FOR CHIEF INSPECTOR OF ENGINES

(Mirrored text)
Extra electrical fittings on cars.
X. 8780.
X. 2515.
X. 4629.

As you are aware, a considerable number of auxiliary electrical fittings are added to our normal electrical circuits on many cars.

These are almost invariably put on to the interior lighting circuit. In a recent car, in addition to the interior lights, special rear stop light and direction indicator, two spot lights, there were fitted three Smith's Portable Cigarette Lighters, which consume roughly 12 amps. apiece, so that I assume if two of them were being heated up together the cutout would be fused.

What is the actual current at which our wire fuses ?

Do you think such a collection on one circuit is reasonable ?

Is it safe, in special cases, to increase the fusing current ?

(Mirrored and upside down form text)
DELIVERY CWB.
Works Order No.
Date
Type
ROLLS-ROYCE ENGINES AND SPARES
CERTIFICATE OF INSPECTION BY V.I.D.
CERTIFICATE NO
R.R. Card No.
Customer's Order No.
Engine No.
Address
Name of Customer
  
  


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