| Year | 1953 |
| Date | 23-Jul |
| Volume | 109 |
| Issue | 2,722 |
| Page | 115 |
| Category | Electrical |
| Part | |
| Title | Hints on D.C. Electric Motors |
| Author | F.Roberts |
| Notes | Shunt motor, compound motor, open circuit spark, sparking brushes, high voltage flash from motor, generator trouble, speed variation of D.C. motor, to obtain A.C. from D.C., 460 V motor on 230 volts, reversing direction of D.C. motor, Interploes polarity |