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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 total armature amperes, loss of volts, and total armature E.M.F.

Identifier  ExFiles\Box 51\1\  Scan023
Date  17th August 1921 guessed
  
Contd. -8-

Total armature amperes
= 12.48

Loss of volts in armature
= 12.48 x .482
= 6.01

Total armature E.M.F.
= 20.61

N = (60 x 10^8 x 2 x 20.61) / (175,000 x 464 x 4)

= 762.

EFC. Da{Bernard Day - Chassis Design}/Thr.
  
  


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