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).
Calculations for the resistance of an armature turn and corresponding wire size.

Identifier  ExFiles\Box 35\4\  scan 037
Date  1st July 1921 guessed
  
-4-

Contd.

Resistance of one armature turn

.0192 x .4
= __________
58

= .001325

Length of armature turn = 10" approx.

Resistance per 1000'

= 1200 x .001325

= 1.59 w

This agrees with proposed size of wire, viz. 14 S.W.G.
(.080" dia.) at 20OC (1.62 w per 1000')

Contd.
  
  


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