| Year | 1930 |
| Date | 01-May |
| Volume | 62 |
| Issue | 1,512 |
| Page | 417 |
| Category | Electrical |
| Part | |
| Title | Converting D.C. Electric Motors to use with A.C.. A Problem of To-day and Near Future |
| Author | |
| Notes | The best course, various kinds of a.c. motors, converting a d.c. motor, secondhand motors |