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).
Calculation table for the ampere turns necessary to produce the required flux.

Identifier  ExFiles\Box 35\4\  scan 038
Date  1st July 1921 guessed
  
AMPERE TURNS NECESSARY TO PRODUCE FLUX REQUIRED.

Part. | Matl. | Length (inches) | Virtual section (sq.ins) | Total flux. | Flux density inch units. | Flux density cm. units. | H.{Arthur M. Hanbury - Head Complaints} | A.T. per inch | A.T.
Armature teeth. | Lamin: Iron. | .450 | 5 x .095 x 2.5 = 1.185 | 161000 | 136000 | 21100 | 498 | 1000 | 450
Armature core | " | .60 | 2 x .450 x 2.5 = 2.25 | 161000 | 71500 | 11,080 | 7 | 14 | 8
Air gap. | Air | .015 | 1.80 x 2.5 = 4.50 | 161000 | 35800 | 5550 | 5550 | 11200 | 168
Pole core. | Lamin: Iron. | .60 | .85 x 2.5 = 2.12 | 193000 | 91000 | 14100 | 19 | 38 | 23
Yoke. | M.S. | 1.55 | 2 x .25 x 4.0 = 2.0 | 193000 | 96500 | 14950 | 28 | 57 | 89
Total | 738
  
  


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