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).
Specification sheet for an armature detailing its construction and winding data.
| Identifier | ExFiles\Box 68\4\ scan0145 | |
| Date | 25th April 1929 guessed | |
| X. 8664 ARMATURE:- 24/48/4. NO. OF SLOTS OR SECTIONS. 24 NO. OF COILS OR COMM+ BARS. 48 " " CONDUCTORS TO COMM. 96 " " CONDUCTORS 384. COILS PER SLOT 2 TURNS PER COIL 4 CONDUCTORS PER SLOT. 16 SLOT PITCH OF COILS. 1 to 5 " " (COMM. END) 1 to 7&8 COMM. BAR PITCH. 1-25-48 ANGLE FOR 20 H.P. 48.0° " " " 40/50 H.P. 46.5° | ||