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).
List of copper weights for the field windings of various starter motors.
| Identifier | ExFiles\Box 61b\3\ scan0115 | |
| Date | 14th March 1921 | |
| X.543 86027 14.3.21. X.543 - STARTER MOTORS. Weights of copper composing field windings of various starter motors :- R.{Sir Henry Royce} R.45 A 3.800 lb Lucas A.510 1.750 lb C. A.{Mr Adams} V.{VIENNA} 2.500 lb Bosch. 3.200 lb EFC. | ||