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).
Hand-drawn winding diagram for an electrical component showing poles and connections.
| Identifier | ExFiles\Box 68\4\ scan0182 | |
| Date | 8th June 1928 guessed | |
| (2) Pole CL Pole CL (6) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 + - | ||