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).
140 turn 20 SWG field winding, comparing its performance curves against the standard winding.
| Identifier | ExFiles\Box 50\5\ Scan175 | |
| Date | 3rd May 1923 | |
| Contd. -3- EFC {E. Fowler Clarke - Electrical Engineer} /T3.5.23. As regards the 140 turn 20 SWG. field winding, this also appears to be no net improvement over the standard field winding. the early stages of the curves being definitely later. These curves are strictly comparative as regards dynamo terminal operating voltage, which is adjusted to our definite scale to correspond to the ampere output. As already stated a standardisation sheet is being issued for the (4) position of the main brushes. E.F.C. EFC. {E. Fowler Clarke - Electrical Engineer} | ||