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).
Electrical resistance specifications for a self-starter motor with a 45-slot armature.
| Identifier | ExFiles\Box 34\3\ Scan136 | |
| Date | 5th March 1918 | |
| X. 26 42 5.3.18. X.2642 - R.R. SELF STARTER MOTOR 45. Slot Armature. Average resistance from brush terminal to brush terminal = .0157 ohms cold Resistance of armature from com: segment to com: segment 90° away = .0114d cold Resistance of field winding coil = .021 ohm. W.R. 255A (500 T) (S.D. 408. 26-4-17.) D&L 2/15613. | ||