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).
Comparison table of technical specifications for two different starter motors.
| Identifier | ExFiles\Box 61b\3\ scan0203 | |
| Date | 10th November 1927 guessed | |
| -2- Contd. Starter Motor Tables. X.4562 X.8620 MOTOR Robert Bosch R.R. E.A.C.S.S ---------------------------------------------------------------------- FIELD CIRCUIT No. of wound poles 2 teaz. 2 main 4 Size of conductor - M.{Mr Moon / Mr Moore} T. 17 SWG No. of turns per coil - 6.5 main. 36 teazer Arrgt. of coils All in series All in series Resis. of field circuit (ohms at 18°C) .0063. M .29. T .01055. M .287. T ---------------------------------------------------------------------- ARMATURE CIRCUIT Type of winding Prog. wave Ret. wave No. of slots 31 41 No. of conductors 62 82 Conductors per slot 2 2 Coils per slot 1 1 No. of coils or comm. bars 31 41 Turns per coil - 1 Virtual conductors 62 82 Winding pitch in virtual conductors - 21 & 19 Step or winding pitch in slots - 10 (1 to 11) Size of conduc. (sq") - .0112 Resis. of armature circuit between .006 .00820 appropriate comm. bars (ohms at 18°C) Ratio of field resis. to arm. resis. 1.05 1.287 ---------------------------------------------------------------------- Contd. | ||