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).
Winding table for a Rotax AT.12 Dynamo with numbered conductors.
| Identifier | ExFiles\Box 68\4\ scan0222 | |
| Date | 17th June 1921 | |
| X. 1640. 17.6.21. X.1005 - WINDING TABLE OF ROTAX AT.12 DYNAMO IN NUMBERED CONDUCTORS. X.1640. Up. Down. Pitch at com: end. Up Down. Pitch at com: end. 9 22 13 com. 35 48 16 8 51 12 7 20 13 33 46 18 5 18 13 31 44 15 3 16 13 29 42 15 1 14 13 27 40 15 55 12 13 25 38 15 53 10 13 23 36 13 49 6 15 21 34 13 47 4 15 19 32 13 45 2 15 17 30 13 43 56 15 15 28 13 41 54 15 13 26 13 39 52 15 11 24 13 37 50. 15 Coil conductor pitch 13 (-13 on coil 8 to 51) Slot pitch or step of winding 3 (1 to 4) EFC. | ||