| Year | 1919 |
| Date | 18-Dec |
| Volume | 41 |
| Issue | 973 |
| Page | 567 |
| Category | Electronic |
| Part | 2 |
| Title | Practical Wireless Notes |
| Author | A.V.Ballhatchet |
| Notes | Basket form inductances, an exaggerated sectional view of lap winding, two methods of winding, switch for avoiding "dead-end" effects, a radial switch |