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).
Specification sheet for Dynamo Field and Armature conductor sizes for 20 HP and Phantom models.
| Identifier | ExFiles\Box 165\6\ img228 | |
| Date | 17th December 1929 | |
| X.5661 17.12.29. DYNAMO FIELD AND ARMATURE CONDUCTORS PER SLOT AND CONDUCTOR SIZES. X 8660. 20 HP. PHANTOM ARMATURE { Normal 16/19 <- 56 coil -> 16/18 { Inter. 16/18 <- 48 coil -> 16/17 { Higher 12/18 <- 56 coil -> 12/17 FIELD 19 -19 EFC. | ||