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 40/50 HP S.S. 6-volt armature with duplex or doubly-re-entrant wave winding.
| Identifier | ExFiles\Box 60\1\ Scan104 | |
| Date | 19th April 1929 | |
| X.7660 19.4.29. WINDING TABLE. 40/50 H.P. S.S. 6-VOLT ARMATURE (DUPLEX OR DOUBLY-RE-ENTRANT WAVE WINDING) X 1640 Com. bars. Conductors. Com. bars. Conductors. 1 1 + 26 + 28 55 + 80 + 55 109+ 22 + 26 51 + 76 + 53 105+ 18 + 24 47 + 72 51 101+ 14 22+ 43 68 - 49 97 10 - 20 39 - 64 - 47 93- 6 - 18 35 - 60 - 45 89- 2- 16 31 - 56 - 43 85 - 110 - 14 27 - 52 - 41 81 - 106 - 12 23 - 48 - 39 77 - 102 - 10 19 - 44 37 73 - 98 8 15 40 + 35 69 94 + 6 11 + 36 + 33 65 + 90 + 4 7 + 32 + 31 61 86 + 2 3 + 28 + 29 57 + 82 + 56 111 + 24 + 27 53 + 78 + 54 107 + 20 + 25 49 + 74 + 52 103 + 16 23 45 + 70 50 99 12 - 21 41 66 - 48 95 - 8 - 19 37 - 62 - 46 91 - 4 - 17 33 - 58 - 44 87 - 112- 15 29 - 54 - 42 83 - 108- 13 25 - 50 - 40 79 - 104 - 11 21 - 46 - 38 75 - 100 9 17 - 42 36 71 96 + 7 13 38 + 34 67 + 92 + 5 9 + 34 + 32 63 + 88 + 3 5 + 30 + 30 59 + 84 + EFC. | ||