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).
Table detailing the winding specifications for three different motors.
| Identifier | ExFiles\Box 62\1\ scan0064 | |
| Date | 9th September 1932 guessed | |
| Part. | First Motor. | Second Motor. | Third Motor. Main Field Winding. | .125 x .062 .0074 sq.in. | .210 x .090 .01855 sq.in. | .180 x .090 .0158 sq.in. Number of Turns. | 4½ | 4½ | 4½ Teazer Winding. | 19 SWG,.040 dia. .001257 sq.in. | 20 SWG,.036 dia. .001018 sq.in. | 18 SWG,.048 dia. .00181 sq.in. Number of Turns. | 30 | 36 | 30 Request. | Hs{Lord Ernest Hives - Chair}/Wst1/MA. 17.12.31. | No request; Instd. by D.O. | Hs{Lord Ernest Hives - Chair}/Wst3/MA. 1.4.32. | ||