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 and connection diagram for Motor J, No 2 scheme.
| Identifier | ExFiles\Box 64\2\ scan0059 | |
| Date | 11th May 1927 | |
| 5A X.7620. RR. S.S.M. 11th May, 1927. Motor J.{Mr Johnson W.M.} No 2 scheme Air gap .012" or .3 mm. Field winding M .1.75" x .080" section. = .0140 (Cond. dimensions) T. 17 SWG. Resistance T. .38 w 18oC M.{Mr Moon / Mr Moore} .015 w Armature res. 18oC. (gross .012 w (nett. .0080 (82 conductors) Cond. dimensions .056" x .2" Field res. /Nett arm. res. = 1.875 MOTOR CONNECTIONS .38 .015 .012 | ||