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).
List of specifications for an armature circuit, commutator, and brushes.
| Identifier | ExFiles\Box 61b\3\ scan0071 | |
| Date | 24th June 1920 guessed | |
| Contd. -2- D.{John DeLooze - Company Secretary} Armature Circuit. (a) Type of winding. (b) No. of slots (s) (c) No. of conductors (n') (d) Conductors per slot (n'/s) (e) Coils per slot (c/s) (f) No. of coils or com: bars (c) (g) Turns per coil (n'/2c) (h) Virtual conductors (2c) (i) Winding pitch in virtual conductors (z) (j) Step or winding pitch in slots. (k) Armature resistance (cold 18ºC). E.{Mr Elliott - Chief Engineer} Commutator and Brushes. (a) Com: diameter. (b) Com: length. (c) Brush contact area. (d) Grade and hardness of brushes. | ||