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 for slot and teeth dimensions, including area, depth and width.

Identifier  ExFiles\Box 35\4\  scan 146
Date  30th April 1923 guessed
  
-4- Contd.

Take copper space efficiency of 50% (say)

Then slot area
= 4 x .00692
= .02768 sq.inches.

Total area of all slots
= 1.02 sq. inches (A)

Maximum slot depth h = √(A/2π) = √(1.02/6.28)
= √.162 = .402"

Minimum slot width w = .0277 / .402 = .069"

Teeht taken .300" deep by .092" wide.

Contd.
  
  


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