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).
Page of calculations relating to useful flux per pole and the number of conductors.

Identifier  ExFiles\Box 35\4\  scan 150
Date  30th April 1923 guessed
  
-2- Contd

= 5/29 x π x 2.850 = 1.54"

= 39 mm.

Length = 2.50" = 63.5 mm.

This gives a useful flux per pole of

6500 x 6.35 x 3.9

= 161,000

Number of conductors

= Tb x 10⁸
------------
1.41 P Ø C

= 36.4 x 2 x 10⁸
-------------------------
1.41 x 4 x 161000 x 120.

= 66.8

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