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).
Specifications for an armature, detailing slots, coils, conductors, pitch, and angles.
| Identifier | ExFiles\Box 68\4\ scan0290 | |
| Date | 1st May 1929 | |
| X 5663 ✓ May '29. ARMATURE:- 28/56/4. NO. OF SLOTS OR COIL FORMATIONS 28 NO. OF COIL OR COMM. BARS 56 " " CONDUCTORS TO COMM. 112 " " CONDUCTORS. 448 COILS PER SLOT. 2 TURNS PER COIL. 4 CONDUCTORS PER SLOT. 16 SLOT PITCH OF COILS. 1 to 7 " " (COMM. END). 1 to 8&9 COMM. BAR PITCH. 1-29-56 M ANGLE FOR 20 H.P. 47.4 M ANGLE FOR 40/50 H.P. 45.9 | ||