| Year | 1929 |
| Date | 14-Feb |
| Volume | 60 |
| Issue | 1,449 |
| Page | 155 |
| Category | Electrical Work |
| Part | |
| Title | Machine-Wound Armatures |
| Author | A.H.Avery |
| Notes | Showing finisged appearance, the winding machine, end and rear views, two correct arrangements of coil spacing, armatures with semi-enclosed slots |