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).
Armature winding specifications for a Bosch lighting dynamo presented in tabular form with a diagram.
| Identifier | ExFiles\Box 68\4\ scan0212 | |
| Date | 22th December 1911 guessed | |
| X 1640 ARMATURE WINDING OF BOSCH LIGHTING DYNAMO IN TABULAR FORM Numbers refer to numbered conductors or groups of three conductors on winding diagrams. UP conductor | Conductor pitch | DOWN conductor | Conductor pitch Bottoms of slots 7 | 10 back | 21 | 12 b 9 | 10 forward | 19 | 8 f 3 | 10 b | 17 | 12 b 5 | 10 f | 15 | 8 f 23 | 10 b | 13 | 12 b 1 | 10 f | 11 | 9 f Tops of slots 20 | 10 b | 10 | 12 b 22 | 10 f | 8 | 8 f 16 | 10 b | 6 | 12 b 18 | 10 f | 4 | 8 f 12 | 10 b | 2 | 12 b 14 | 10 f | 24 | 7 f Element of winding [Diagram showing connections for points 9, 19, 21, 24, 3, 7] Slot pitches:- (1) 5 back at back (2) 6 " " front (3) 5 forward " back (4) 4 " " front | ||