| Year | 1931 |
| Date | 04-Jun |
| Volume | 64 |
| Issue | 1,569 |
| Page | 547 |
| Category | New Tools and Supplies |
| Part | |
| Title | Batwin Electric Motors, D.C. and A.C. |
| Author | |
| Notes | Motors for alternating and direct current, interchangeability, desiderata in small alternating motors, invention of repulsion motor, the repulsion induction motor, Batwin motor automatic brush-lifting and short-circuiting device, good starting torque, silent running, repairs and loan service, health by electric power, Batwin motor: spring suspension type, a magneto and coil tester by Magneto Services |