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 2 of a document detailing calculations for the armature of a four-pole machine.
| Identifier | ExFiles\Box 68\4\ scan0226 | |
| Date | 10th October 1921 | |
| R R.{Sir Henry Royce} 285B (100 T) (S.H. 798.10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2948 Contd. -2- R1/G10.10.21. sections fulfil the ordinary conditions of the calculations, the number of slots in the armature for a four-pole machine should be four times x plus 1, this giving the least amount of copper on the armature and the best commutation owing to the winding being in the neutral position i.e. pitch of coil just the minimum less than pitch of poles. R.{Sir Henry Royce} | ||